I recently received a few extra bikes from a friend and decided to try making a tall bike from one of the frames. It is basically just an upside-down bike since I just flipped the frame. The seat post and handle bars needed to be longer since the pedals were so much higher. It took a bit of welding and some work getting the chain tensioned without the derailleur. It’s functional, but also a bit scary being so far from the ground. In the future, I would make the bend for the handle bars closer to the frame, as it is a bit awkward to steer.