Is there a way I can share a disk image as a remote DVD drive?
If you can manage a cheap 8GB USB flash drive, try read these links


http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
http://osxdaily.com/2009/09/02/install-snow-leopard-from-external-firewire-or-usb-hard-drive-or-how-to-upgrade-to-106-without-a-dvd-drive/