This has turned into a much bigger project than I ever imaged! I replaced the whole rear end with a kids suspension bike frame with a 6 speed cluster and a proper brake setup. Then I decided the whole thing now rode way too close to the ground. I replaced the spindles to be able to install the 20" custom wheels off the old trike. This gave us a lot more ground clearance and hopefully easier rolling. I need to install the new tie-rods, and provide a shifter and brake lever. Hopefully, we will have our first test ride this weekend!