Now I'm thinking, I have a mini bike here I built for my so probably 10 years ago and after it did a big wheelie and dumped him on the ground it has just been sitting here, might be a good starting point, I also have an Anniversary Greenie here and it would be simple to fit the rear axle into the bike and then it would be a trike. Then just a case of working out how to steer it. Might try steering wheels out the front. I have a number of 24's here to play with mounting it