Just found these pics of my first rigid bike. Was great fun to ride pretty tatty and noisy as hell. i didnt build it, just modified, like battery pack in pannier with those wires running to it - total loss system that would JUST get me to work off a full battery jump-start pack for a car. nice carry mat and duct tape seat - 2 layers of comfort. was fun while it lasted - but the engine was on its arse and the charging side was completely dead so i sold it for cheap and moved onwards and upwards.