Always wanted one of these, and needed another Design and Technology project for my A-level. So I
built one - everything apart from the cranks and rim. Machined crown, hub, axle and bearing housings.
Stainless tubing and I even made the (original) seat. I started off on 170mm cranks, and it was rideable,
but was so much easier when I shortened them to 155mm. Still never got really good on it, but can ride
up and down my road, perhaps one day I'll practice more to get good!