What a great idea,just set out a few parameters beforehand for the basics like body shape,neck taper etc.... then just have a vote on top woods and the other major considerations,don't over complicate it all,then let Alembic just decide on the finer details.
Everybody who wants to take part send in your money and off we go.For $50 or $100 i think you may get a lot of interest,i for one would certainly love a custom build for that price even if the wood etc wasn't what i'd choose if i were having it made for myself.
It does not matter if you do not win,but there is a chance that you may win,exciting! Pop every participants name in a hat and then just get Mica to pull one out and BINGO some very lucky so and so's got a brand new bass Superb!