Wow, those are sweet! and very affordable, unlike Segue's, and mine, if I made any to sell.

His wheel mounting is almost exactly what I'd like to do on my next trike. It fits a standard 26" wheel, with disc brakes protected on the inboard side. Even has good mounting positions for fenders.

But anyway, to the OP, if you run into any issues, or just need some inspiration, don't hesitate to PM me. I've spent alot of time thinking about the issues involved in building more of these things.