RE: home made game cart
A word of warning: It is simple to look at a few commercial designs and figure out an easy way to replicate it. I did just that a few years ago, laying my hands on some very stout 2" square aluminum tubing which comprised most of my cart. But by the time I bought the wheels and everything else, I could have bought a factory-made one for almost the same money and saved myself the time in the process. Bass Pro runs their game cart on specials from time to time for around $79, and I've got that much cost in materials in mine.