This was actually an idea I had myself...
...I'll likely never get around to doing it, but I figured I'd give you
some of the mental notes I had about mine [since I can't find my old ones anyway].
Thank you! Perfect! I didn't quote the whole list, but I'll respond to the whole list.
1) I tried to find something good, but only found the Plumber's Set. I haven't tried the Mining Set. I'm using Familiar Hair, with the best hairdo I found, so no visible helmets.
2) All building and wiring accessories and tools. I've got the Gizmo Pack, The Plan, and wire path separators.
3) If it can be set off by wiring, or placed and stepped on, it counts. If I have to use it directly, like a weapon, it doesn't count. Bombs don't, but Explosives, cannons and Explosive Bunnies do. Bombs still work for mining, though.
4-5) As for aesthetics, most of it will be "make it work now, make it look good later". I like having it look good, but it has to be practical first. And I'm lazy. As for what I can get, between the amount of wire I'll need and the fact that many things only generate one type per world, or are more rare than is feasible, I'm using Builder's Workshop. My rules are, roughly, "if it's for building or wiring, and I'm progressed far enough to get it, (i.e., Demolitionist moved in for dynamite, Picksaw acquired for Temple traps, etc.) I can get it from the Workshop." That'll need refining, but it's a good start. What'cha think?