I have three complete Warmoth guitars and a 4th neck on my old Pacer and a 5th unused at the moment. Im almost certain you will have to get the final assembly done locally or just do it yourself - if thats what you mean by "Do they charge for labor?"
I have found thier products consitantly excellent and never had an issue at all. I think what most people find irksome about Warmoth is that you get exactly what you ask for. If you ask for good tonewood combinations, you will get a good
sounding guitar, if you ask for odd or uncommon tonewoods, you are rolling the dice a bit.
To give you an idea of the stuff Ive tried and I love, here are the Warmoths in my collection:
Swamp Ash Strat Body - clear finish, H/S/H, recessed OFR, Maple neck/Ebony FB - no inlays, reverse strat headstock - neck profile Wolfgang - nut width 1 5/8
Alder Strat Body - Trans Green FM Top, H/S/S, recessed OFR, Maple/Rosewood FB - dot inlays, CBS headstock -neck profile Standard thin- nut width 1 5/8
Alder Strat Body - Trans Honeyburst Quilt Top, S/S/S EMG DG-20 set, Wilkinson Tremolo, Maple/Ebony FB - no inlays, Reverse Strat headstock with matching Quilt maple veneer - neck profile Standard Thin - nut width LSR Spacing (I think thats 1 11/16 cant remember atm)
Maple/Maple Explorer headstock - heavy Birseye - OFR Nut Route
Maple/Rosewood FB - OFR NUT Route - reverse Strat headstock - neck profile Boatneck - unused atm