Long time custom framebuilder Terry Osell has built several Mini Bikes. Non folders with conventional frames and 406 or 349 wheels. I may be riding with him tomorrow, in which case I'll get photos and ask what he charges.

I suggest you go to http://www.hadland.me.uk/page15.html and scroll down to;
The Velocio approach - medium diameter balloon tyres
A photo of one of Velocio's bikes can be seen at
http://www.ville-carpentras.fr/cps/i...de/velocio.jpg

There are now 3 tires available that are suitable for such a bike. Wide, yet supple enough to roll easily with 35 psi. Schwalbe's 406-60 Big Apple, the very light Primo Comet 406-56 Red Label and the featherweight KHE Premium Folder 406-54.

The Rene Herse Demountables were very low tech. I think anyone with a bit of skill would be able to replicate the idea. Jane is interested in having me build a couple of small wheel demountables, so we could fit two bikes in the trunk of our Chevy Prism (Toyota Corolla with different badges.) It's been a couple of decades since I built a non-recumbent, so this sounds like fun. My last bike, a fat tired, small wheeled recumbent weighs 23.5 lbs with Big Apples so I think I could get a fat tired Mini under 20 lbs as a one piece or 21.5 as a demountable.

Instead of a long steerer, I'd prefer long blades. I do have a couple of very high quality, new 406 forks with 16" steerers if anyone wants to try that approach. I don't think they would take a really fat tire though.