I bought a trike somebody pieced together to convert my wife's Spaceliner to a three wheeler. It looks like a Ret Bar single drive off a Schwinn Town and Country because I see Campus Green paint under the black spray paint. My question is order if assembly. Do I assemble the rear end and install it on the frame as one piece, or do I install the axle to the frame , then add the basket frame to the bike afterwards? And how do I know if the rear wheels are parallel to each other?