I'm leaving my intellevision out of the shelves for my rig, I want a table down there infront of the couch\futon I don't own, so I'll put it there, since the controllers are so small, and I'm not a fan of modifying consoles if you can't set it back the way it was. same with C64, odyssey 2, and if I ever get one, amiga, since these all have keyboards you use a lot. The Atari 2600s I'll just make sure to have lots of extra length on the power and RF cords, to move if needed, depending on the game.
That is one mod I was thinking about doing, remote switches for an Atari. And since I have one with a busted case and a hole in the side, I don't feel bad about destroying a classic machine.