I build a Leopard 2A5 German Army Test Vehicle not long ago from MiniHobbyModels. For a motorized "carpet-crawler", it is a really good kit. Pretty basic, but it looks pretty nice when put together. The instructions are misdrawn in a couple blaces (there is no access door for the batteries, contrary to the instructions) they are still simple, and its easy to guess or research the correct look of mislabeled steps. Even comes with a figure.
There is a simple switch on the bottom, with a slot cut in the hull just big enough for the switch to move positions (forward and off). Wheels are attached by screws that line up well, go in easy, hold, and are easily painted over and kind of blend in after painting.....well, as best as screws can. The upper and lower hull can be glued together, as the battery box is conviently located right below the turret. Pop the turret off, put your batteries in, put the turret back in its ring, and enjoy lol.