ORIGINAL: deckerv
If you do it simply for the love of the hobby, more power to you

I have in the past built models for other people, but not for money. I've built a Goldberg Chipmunk and covered/installed everything to make it RTF for a Futaba 8ch radio, have built a Goldberg Sukhoi for a Sukhoi kit and glue, Goldberg Extra 300 for the same...etc... I have done it mostly (and would love to still do it) for the love of the hobby.
When you do a trade like this , do you build both at once ?