diff --git a/installer/build/bootable/build-disks.sh b/installer/build/bootable/build-disks.sh
index 9448d1bfa4..a501ce6077 100755
--- a/installer/build/bootable/build-disks.sh
+++ b/installer/build/bootable/build-disks.sh
@@ -147,11 +147,18 @@ function convert() {
 }
 
 function usage() {
-  echo "Usage: $0 -p package-location -a [create|export] 1>&2"
+  echo "Usage: $0 -p package-location -a [create|export] -i NAME -s SIZE -r ROOT [-i NAME -s SIZE -r ROOT]..."
+  echo "  -p package-location   the working directory to use"
+  echo "  -a action             the action to perform (create or export)"
+  echo "  -i name               the name of an image"
+  echo "  -s size               the size of an image"
+  echo "  -r root               the mount point for the root of an image, relative to the package-location"
+  echo "Example: $0 -p /tmp -a create -i vic-disk1.vmdk -s 6GiB -r mnt/root -i vic-disk2.vmdk -s 2GiB -r mnt/data"
+  echo "Example: $0 -p /tmp -a create -i vic-disk1.vmdk -i vic-disk2.vmdk -s 6GiB -s 2GiB -r mnt/root -r mnt/data"
   exit 1
 }
 
-while getopts "p:a:" flag
+while getopts "p:a:i:s:r:" flag
 do
     case $flag in
 
@@ -161,36 +168,34 @@ do
             ;;
 
         a)
-            # Optional. Offline cache of yum packages
+            # Required. Action: create or export
             ACTION="$OPTARG"
             ;;
 
+        i)
+            # Required, multi. Ordered list of image names
+            IMAGES+=("$OPTARG")
+            ;;
+
+        s)
+            # Required, multi. Ordered list of image sizes
+            IMAGESIZES+=("$OPTARG")
+            ;;
+
+        r)
+            # Required, multi. Ordered list of image roots
+            IMAGEROOTS+=("$OPTARG")
+            ;;
+
         *)
             usage
             ;;
     esac
 done
 shift $((OPTIND-1))
-if [[ -n "$*" || -z "${PACKAGE}" || -z "${ACTION}" ]]; then
-    usage
-fi
 
-# These sizes are minimal for install, since partitions are resized to full disk space after firstboot.
-IMAGESIZES=(
-  "6GiB"
-  "2GiB"
-)
-IMAGES=(
-  "vic-disk1"
-  "vic-disk2"
-)
-IMAGEROOTS=(
-  "${PACKAGE}/mnt/root"
-  "${PACKAGE}/mnt/data"
-)
-
-# check there were no extra args and the required ones are set
-if [[ -n "$*" || -z "${PACKAGE}" || -z "${ACTION}" ]]; then
+# check there were no extra args, the required ones are set, and an equal number of each disk argument were supplied
+if [[ -n "$*" || -z "${PACKAGE}" || -z "${ACTION}" || ${#IMAGES[@]} -eq 0 || ${#IMAGES[@]} -ne ${#IMAGESIZES[@]} || ${#IMAGES[@]} -ne ${#IMAGEROOTS[@]} ]]; then
     usage
 fi
 
@@ -200,7 +205,7 @@ if [ "${ACTION}" == "create" ]; then
     BOOT=""
     [ "$i" == "0" ] && BOOT="1"
     log2 "creating ${IMAGES[$i]}.img"
-    create_disk "${IMAGES[$i]}.img" "${IMAGESIZES[$i]}" "${IMAGEROOTS[$i]}" $BOOT
+    create_disk "${IMAGES[$i]}.img" "${IMAGESIZES[$i]}" "${PACKAGE}/${IMAGEROOTS[$i]}" $BOOT
   done
 
 elif [ "${ACTION}" == "export" ]; then
@@ -209,7 +214,7 @@ elif [ "${ACTION}" == "export" ]; then
     log2 "exporting ${IMAGES[$i]}.img to ${IMAGES[$i]}.vmdk"
     echo "export ${PACKAGE}/${IMAGES[$i]}"
     DEV=$(losetup -l -O NAME,BACK-FILE -a | tail -n +2 | grep "${PACKAGE}/${IMAGES[$i]}" | awk '{print $1}')
-    convert "${DEV}" "${IMAGEROOTS[$i]}" "${IMAGES[$i]}.img" "${IMAGES[$i]}.vmdk"
+    convert "${DEV}" "${PACKAGE}/${IMAGEROOTS[$i]}" "${IMAGES[$i]}.img" "${IMAGES[$i]}.vmdk"
   done
 
   log2 "VMDK Sizes"
@@ -218,4 +223,4 @@ elif [ "${ACTION}" == "export" ]; then
 else
   usage
 
-fi
\ No newline at end of file
+fi
diff --git a/installer/build/bootable/build-main.sh b/installer/build/bootable/build-main.sh
index 6a4f29b0ed..4bec6f086e 100755
--- a/installer/build/bootable/build-main.sh
+++ b/installer/build/bootable/build-main.sh
@@ -22,6 +22,21 @@ BASE=""
 CACHE=""
 MANIFEST=""
 
+IMAGES=(
+  "vic-disk1"
+  "vic-disk2"
+)
+IMAGEFILES=("${IMAGES[@]/%/".vmdk"}")
+# These sizes are minimal for install, since partitions are resized to full disk space after firstboot.
+IMAGESIZES=(
+  "6GiB"
+  "2GiB"
+)
+IMAGEROOTS=(
+  "/mnt/root"
+  "/mnt/data"
+)
+
 function cleanup() {
     log1 "--------------------------------------------------"
     log1 "cleaning up..."
@@ -107,9 +122,11 @@ function build_app {
 }
 
 function main {
+    IMAGEARGS=("${IMAGES[@]/#/"-i"}" "${IMAGESIZES[@]/#/"-s"}" "${IMAGEROOTS[@]/#/"-r"}")
+
     PACKAGE=$(mktemp -d)
     # create disks
-    "${DIR}"/build-disks.sh -a "create" -p "${PACKAGE}"
+    "${DIR}"/build-disks.sh -a "create" -p "${PACKAGE}" "${IMAGEARGS[@]}"
 
     # extract or build base install
     log1 "Installing base os"
@@ -129,16 +146,22 @@ function main {
     build_app "${PACKAGE}/mnt/root" "${PACKAGE}/mnt/data"
 
     # package
-    "${DIR}"/build-disks.sh -a "export" -p "${PACKAGE}"
+    "${DIR}"/build-disks.sh -a "export" -p "${PACKAGE}" "${IMAGEARGS[@]}"
 
     log1 "--------------------------------------------------"
     log1 "packaging OVA..."
     cp "${DIR}"/config/builder.ovf "${PACKAGE}/vic-${BUILD_OVA_REVISION}.ovf"
     cd "${PACKAGE}"
-    sed -i -e s~--version--~${BUILD_OVA_REVISION}~ vic-${BUILD_OVA_REVISION}.ovf
+    log2 "updating version number"
+    sed -i -e "s|--version--|${BUILD_OVA_REVISION}|" vic-${BUILD_OVA_REVISION}.ovf
+    log2 "updating image sizes"
+    for image in "${IMAGEFILES[@]}"
+    do
+        sed -i -e "/<File.*${image}.*/ s|ovf:size=\"[^\"]*\"|ovf:size=\"$(stat --printf="%s" ${image})\"|" vic-${BUILD_OVA_REVISION}.ovf
+    done
     log2 "rebuilding OVF manifest"
-    sha256sum --tag "vic-${BUILD_OVA_REVISION}.ovf" *.vmdk | sed s/SHA256\ \(/SHA256\(/ > "vic-${BUILD_OVA_REVISION}.mf"
-    tar -cvf "${RESOURCE}/vic-${BUILD_OVA_REVISION}.ova" "vic-${BUILD_OVA_REVISION}.ovf" "vic-${BUILD_OVA_REVISION}.mf" *.vmdk
+    sha256sum --tag "vic-${BUILD_OVA_REVISION}.ovf" "${IMAGEFILES[@]}" | sed s/SHA256\ \(/SHA256\(/ > "vic-${BUILD_OVA_REVISION}.mf"
+    tar -cvf "${RESOURCE}/vic-${BUILD_OVA_REVISION}.ova" "vic-${BUILD_OVA_REVISION}.ovf" "vic-${BUILD_OVA_REVISION}.mf" "${IMAGEFILES[@]}"
 
     OUTFILE=${RESOURCE}/vic-${BUILD_OVA_REVISION}.ova
 
@@ -187,4 +210,4 @@ fi
 
 exec 3>&1 1>>"${RESOURCE}/installer-build.log" 2>&1
 log1 "Starting appliance build."
-main 2> /dev/fd/3
\ No newline at end of file
+main 2> /dev/fd/3