[remulasce]

This is a lot easier than it seems. Remember, the mini bot already uses a standard part system- FTC. All you need to do is drill FTC style holes all over a plate of metal. Then, before a match, determine where you want to connect mini and host bots on the plate, and put a bolt or shaft facing straight up at that point, with no nut holding the mini down. It is simply to prevent side-to-side movement. The mini is responsible for sensing that it is connected to the tower, at which point it must pull itself straight up, cleanly off the shaft/bolts. The host bot must extend the plate, with the mini bot, to the tower. No wiring or detach systems necessary.