I havent been able to find them but there was a retro time trial thing going on a few years back. They were doing time trials around Thruxton circuit and not being bound by current time trial regs you could use any of the weird and wonderful TT bikes.
This is an interesting hack to create a hybrid tubeless and latex system
https://www.cyclingnews.com/news/why-did-keegan-swensons-wheels-have-two-valves-each-at-unbound-gravel/
Basically; they run tubeless but drilled the rims for another valve hole and that is for an un-inflated latex tube...
Fit a short hanger extender. They are cheap off ebay and you dont need to fork out for a Wolf Tooth Road Link. The mech will manage the difference between the small and largest gears
Regarding old school minis i have always preferred a super revvy engine with 80-90ish horsepower. lightweight engine internals, super light flywheel, quality clutch, and a cam and carb combo that picks up quick sharp and revs on. Programmable ignition is the way to go instead of fecking about...
I think it is a pair. One out of the bag to show details. Would be a slow burn project but it would be fun to build a nice italian CX bike up with FRM.
Might have written mine off so putting feelers out there for a replacement. An E4 is of interest too.
Please pm as i am having problems presently navigating the site with my brain.