Get some REALLY GOOD riders to ride your frames (if possible) and then when people see that the frame is holding out for them, that would then get you some decent rep.
Also I think that price is fair, and I would presume paying extra for add-ons such as in-built booster would be fair too.
Would the price be cheaper for 20" as well as less material is used and more likely less work (i presume?).
Just a few general questions about your frames:
How much did it weigh after?
How has it held out, did it dent easy (if dented), cracks, snap, creases?
I would be interested in getting one custom made from you, however only had my limey 320 for about 4-5 months so wont be any time soon
Sounds good though, will be interesting to see how this works out for you. - Topic Watched.
Take into account the following:
Material cost - try and split the cost to a one unit price.
Labor cost - should be one set price for 20" and a little more for 26" as more work is needed.
Then add a little extra on for some profit. - MARK UP PRICING.
Shipping wouldn't be included as you would add that on afterwards.