Nik, I know this is a older post but I am very interested in making a frame like this. Do you have any kind of plans? Or can you tell me what was used for the carriage? Is it light weight? Can you fold up to store when not in use? Can you work it from the front instead of the back of the machine so I could be closer to the work? He also wanted to know what the bike brakes are for? Sorry for all the questions. My DH is very handy and am sure he could make one for me.