£70 brand new single speed frames...

You should definately push him to start doing that, I am looking to start a new build next year and a road frame for under £200 is a nice number. I'm guessing he would do forks as well then?

He would yes, but like I said its an unfamiliar market for him and hes worried he wont even sell 100 frames. I think people showing interest is important, then some help with the design & promotion of the item is key. As the speedway frames have always been sold on a downlow local way of the niche sport.