An interesting thread, James, and one I can definitely relate to...since I am doing it all over again for the third time...
My third time ( happening now) I got a bookmatch to center, which I did not get on the first 2 and I went for series I electronics.
But generally I keep buying custom Alembics because I love them and I'm greedy for more, like an art lover who wants more paintings, not because I'm ever disappointed in any way with what I've done before.
I like them to look somewhat similar, but I also want them to be different. So other than a coco bolo top and deluxe purpleheart laminates, & Fender Jazz neck dimensions, I tend to change the other components ( mainly the body shape, and the Electronics).
My first custom was a MK Deluxe( coco bolo, of course) with a triple omega balance point shape ( heart at the bottom) deluxe neck, continuous wood backplates & truss rod cover, the second was a coco bolo Rogue with modified essence body shape(chambered), deluxe neck, fat boy pickups, knobby peghead and ash body. Since this one had no back laminate, brass backplates rather than wood...for some reason I can't remember I did not do a wood trussrod cover..i should have...that is a real classy touch that is relatively cheap as an option. As for the side leds, i love 'em ...those will come one day, I'm not in a rush, since I'm not playing on any stages at the moment, although that may change. Of course if I had more money I'd go for more outrageous stuff, like superbright laser inlays and so on...still, I gotta leave myself something to dream about... Call me crazy, but I actually don't ever want to be in the position of being able to say that I satisfied every Alembic craving I got... It's too much fun
I understand your desire for a quick change battery compartment...problem I've always seen with those, working for 3 years in a music store, is that being plastic, the little covers/doors that hold the batteries in break fairly easily, and then often you'd need to replace the whole compartment, a major pain...many folks would end up holding their batteries in with tape....from what I've seen of the folks at Alembic over the years I don't think that would be acceptable to them...
now, if the whole frame & little cover/door of the contraption could be made of brass...I'd ask Mica if she thinks they could do something like that, after all you just need a frame and a small swiveling door with a latch to cover the battery cavity...I don't think I've ever seen those quick change compartment covers made of anything other than plastic
My humble 2 cents
Valentino