Shoes, was just sitting here looking at pic thinking the same thing. I have an old wheel chair below and would love to do this one. Any ideas on beefing up the carriage? Am thinking heavy steel L beams. Hmmmmm that a thought! make a floor like a scooter!
(Great, another crazy want/project. does it ever end?)
I like that design on the first post but I would change it by bringing the steering head and everything closer so you can use BMX style handlebars for better handling and you can still have room for your feet. It's brilliant how he used every moving part of that minibike/whatever so gearing is not a question.