I use them with fixed bridges and love them! I'll never go back for that matter. you can get chrome Schaller Mini Locking Tuners for $51 a set at warmoth.com . For that price, theres nothing dumb about it.
Gotta agree with Greg, Not "necessary" perhaps, but nothing wrong with spoiling yourself. For all the work you are doing to build it, whats a few more bucks in the end going to hurt?