They'll include a manufactured PCB, components, and a drilled enclosure, and cost something like $60. I'll be sure the price is inline with comparable kits.
I figure it would be best to strip some things from them, and let you decide what parts you want to wire up because the full ones have quite a bit of external wiring (compared to, say, an LPB or Fuzz Face). I'd also use more "normal" switches that are easier to solder to.
Here's a gut shot of a fuzz one:

And Aardvarks! And Guts! by McSpunckleFX, on Flickr
I'm thinking the best way to do it would be to make the toggle and tone control optional, and lay out the PCB to make it extra easy to build. Looking for input from the people that are actually gonna be building them. : D



