Decades ago I saw a wonderful side car conversion of a Honda CB 450. The hack was blatantly ugly, all a square and with a ramp up the back and what is that...handlebars for the hack and none on the bike. It had been made for a paraplegic who would ride his chair into the hack and control the bike from there. The shift lever on the case had solenoids above and below and a set of buttons so that the rider could shift. Pretty cool stuff.