Right now I have a semi-hacked 7" widescreen LCD, wii, and 320GB 2.5" HDD
It's pretty much what my wii development setup has been so far, but without a wifi router.
Now for things to decide on: Battery or not? If not I'll probably have a power supply built-in. I don't have a multimeter (or soldering iron) on me at the moment, so don't have stats on the draw for hdd + wii + lcd, but I'd assume that I'd have a max of 2 hours on a normal battery.
I'm probably going to just have the unit be completely separate from the wii itself and build most stuff into the (now) mostly empty LCD case. I'm going cheap on this, so it's mostly function over beauty unfortunately.







