I am going to say something and I know some people are going to say I am a jerk for saying it but if I found out the person I was buying a "custom made pot" from was using a pre-made pot I would never do business with them again.
I would also not BUY from a "maker" that used kits at all because I put kits together myself so why would I want to pay somebody to do what I am doing already? I would take one as a gift and have given kits that I have made as gifts myself.
Sorry but I am just being honest.