These are a few of the bikes I have made in the past. The first one was held together with rivets and then silicone which looked like it was welded. the second and best was the Tandem recumbent bike I built in Mexico in 2003 and the last bike I built which started out as a side be side and worked better as a single bike. I will try to put an constructable for each if there is enough interest. I am thinking of building another tandem bike soon.