-vm_disk="$build_dir/nd-${vm_version}_${vm_arch}.vdi"
-vm_name="${vendor} VirtualMachine${vm_arch_name}"
-vm_ovf="${dist_dir}/${vendor}_${vm_version}_${vm_arch}.ovf"
+vm_fprefix="${vendor}_${vm_version}_${vm_arch}" # common prefix for files
+#vm_disk="$build_dir/nd-${vm_version}_${vm_arch}.vdi"
+vm_disk="$build_dir/${vm_fprefix}.vdi"
+vm_name="${vendor} ${vm_version} ${vm_arch_name}"
+vm_ovf="${dist_dir}/${vm_fprefix}.ovf"