Wiring INSIDE the frame is fine for show bikes, not so great for bikes that are ridden, you have to run small gauge wires INISIDE the frames, there are chaffing issues and seen many shorts and melted harness's plus sooner or later the bike needs service, hard to do when the wires inside, plus harder to have good connections and terminals,
plus all those holes in the frame compromise strength of the tubing, the only PROPER holes are tubed, if drilling a hole, you insert a piece of metal tubing and weld it in place
I gave up on wiring inside the frames many years back, suit yourself, if thats what you want to do, carry on,
I like to tidy up the wires, lay it all out, minimilize, but put in good terminals and connections (chasing random intermititant shorts and connectivity sux) and use lots of shrink wrap and properly soldered and connected. Use wire sheathing, or,,, in one case, we routed copper tubing and ran the wires in that. (Steam punk bike)
Other than that. cool stuff. I used to build a lot of chopper stufff, have a few chop projects in storage still.