we see tons of folding designs from those students every year, some are neat and cool but 99.9% of them probably would never reach the manufacturing floor once they start sourcing for usable materials and testing for practicality and engineering stress points. The only one I know of that was successful was Mark Sanders and his strida model. He actually started that from scratch and if you followed his story you can see all the hundreds of tweaks and fixes he needed to do to his design to even make it practical for everyday use. Like Fietsbob was implying.... it's easy to have it on a CAD image, but much harder to get it into a working model.