So, an egg of creativity hatched in my brain, so to speak, and the fruits of my labor, I felt, were worth sharing. Thus, in light of some clever fixes, workarounds, and general how-am-I-gonna-pull-this-off wonderment, I give you...*drum roll*:
I've got an undying love for the 8-bit, and playing around in Banjo-Kazooie Nuts & Bolts, it hit me. I could likely make some neat looking pixel art with the grid-oriented building system. So, thus far, I have created Mario, Luigi, the Question Mark Box, and Birdo. All of them are, in fact, driveable, and three of them have abilities. Mario and Luigi throw grenades for the time being, though once I have access to the flamethrower...well... ^_^
Birdo, on the other hand, fires eggs from his/her mouth. They're not very big, and they don't do much damage, but they're eggs, dammit! The Question Mark Box is one I did quickly for the fun of it.
I've gotten a couple of requests already, so I'll be looking into Battletoads and Bad Dudes next, but we'll see what happens. There are, however, still limitations to what I can do. You can only go about 19 blocks high, 19 blocks wide, and I assume 19 blocks thick, and you may only employ 250 pieces. An 8-bit 16-pixel-by-16-pixel sprite is 256 pixels, and I currently only have 100 grid blocks of light and heavy, so there are some nasty roadblocks, but all in all, I've managed to over come them sufficiently to my satisfaction. ^_^
Anyway, I hope you enjoy them. If you really sweet talk me, I might send you the blueprints for the ones you'd like. Just send a PM and we'll work it out or something. Cheers.
Edit: I've produced a new vehicle, one I was anticipating the opportunity to make a great deal. I give you....Balloon Fighter: