I would jump at that before they change their mind. I would charge $800 at least to do that guitar.I have one quote to finish it in nitro for $500. That includes Vintage tinted color and black shot on the front of the peg head.....and buffed.
Finishing is by far the most time consuming part of a guitar build. It can be extremely frustrating if you don't know what you're doing. It's still frustrating to me at times and thats after hundreds of guitars. Also, Limba is very porous and you'll need to grain fill it a couple times or you'll just shoot nitro on it until next year trying to fill that grain.