DUDE! That variable geometry speeder is so awesome! I have one of those backpacks clogging up the parts bin, what a cool use for it! Also, I really dig the AT-AT mod. I'm doing something similar for the total AT-AT repaint I'm slowly working on. I also dig the mods to the Cap'n America vehicle. Keep up the good work!
I've never tried to add legs to somethin' before, but screws or magnets seem like two good options.