Thanks guys, will update once I'm back from working away.
So far from the feedback I think I'll be doing an xdk height case with jewel, reminiscent of the original case but with some more modern style cues.
I'm also thinking of a removable rear panel that can either have the outputs that have been requested or blanked off (two separate plates).
I may raise the hdd and dvd rom trays/brackets to allow more space below for ogx360's and other mods, however that would require a longer IDE cable and possibly extensions for the hdd/dvd rom power. Another option is to have the ogx360 above the dvd rom.
There will be at least one front usb port and I'll do an lcd version and a non lcd version of the case.