The local hobby shop owner wanted me to build for some customers. I told him I wouldn't know what to charge. A few other guys said they would build just for a duplicate kit for themselfs. No, not me. I thought of a flat fee like $100 or maybe what a Franklin Mint car would cost. They laughed. Now my price has gone up.
I got offered $50 for a paint job which I think is fair but, the guy never came through. Look what the "Old Man" charges, about $300 I think, and he does some award winning work. I say make it worth your while and build your confidence in your own work, or just build for yourself and enjoy.