My projects are generally inspired by classic designs, but with a twist. I like to build things like basses on guitar bodies, non-standard scale lengths, and occasionally originals, and experiment with materials, finishes, and electronics. One of my great interests is driving the cost out of luthiery by sourcing parts and materials from the hardware store. I prefer to build more guitars than simply more-expensive guitars.
I only use clip-less battery boxes for two reasons. First, those 9-volt battery clips may be tolerable for a smoke detector, but if you plan to use it a lot, it is a pain in the ass, and then it breaks. And second, 9-volt batteries ( all batteries, really, but especially 9-volts ) are guaranteed to leak, and should never be left inside a device unless absolutely necessary. I only put a battery in a guitar ( or anything else ) when I want to use it, and then take it out afterward and keep it in a little dish. That's much easier if it just slips in and out and you don't have to mess with one of those stupid clips. And if when it leaks, I just throw it away and wash out the dish.