The gauntlet + glove is a super easy piece to make. The easiest you might think about. Expecially the mk42 if this is what you're looking for. If you wanna make an extremely easy glove, there's a topic with some templates and pictures that explains everything. It should be called "iron man easy gloves" or something like that.
I cannot say anything about the electronics beacause I can't solder and do all the maths, but I bought a couple of LEDs, a plastic bottle cap to make the repulsor itself and a double CR2032 battery holder with a small switch. A friend of mine assembled the whole thing. If you have a small LED torch to scrap, then go for it. It works great and it's close to free.
But if you're looking for some high quality stuff, then yeah, darkmatter props makes an amazing gauntlet.
