Agree with the "helping out" statements.

Personally, I would either work WITH the guy for beer & snacks or not do it at all. Have no interest in doing plane assembly for pay.

As for getting what you pay for my team has built hundreds of virtual aircraft for a number of online combat flight sims. They are all freeware & considered some of the best available on the net freeware or payware. You get what the person doing the work is willing to put into it regardless of how he is compensated.