Awesome work! I only just did my first custom 64 in December and am working on a mini one at the moment. Why don't you upgrade the joystick to avoid them going lose? You can get the Gamecube style ones on ebay for $9
Why, the guy has one of the biggest N64 collections in the world. A bunch of his stuff is still sealed and the rarest consoles are not to be played as well. The console I made has a solid black paint job, its the hardest paint to keep clean and scratch/hologram free so its better off to keep behind glass.
Well I guess that if its in a larger collection then that makes sense. Bit like a show car thats just for looks, I just like awesome looking stuff that still gets used but if its treated as a piece of art instead it will last longer for your client and it sounds like he has enough 64's to play on to keep that in a case!