Ryobi is doing a good job on the interchangeable battery scene with their 18V products. I suspect they are very 'consumer grade' though.

For the pilot device.... I will drill the hole size I want in a piece of scrap material and affix it over the existing hole. (This also works good if you've broken the pilot bit.) Another cheat I use is with a knockout punch set. You can get 3/4" and 1" conduit dies that fit the 3/8" draw stud. Gives you lots of flexibility if you are starting with a 7/8" (1/2" conduit)hole.

Interchangable truck bodies is almost a reality. The local phone and power utilities are using more and more camper shells on pickups instead of outfitting vans.
[Linked Image from spacekap.net]
[Linked Image from littletipster.com]