:-IThey key is to do everything back to front.
The support bar goes in behind the side car seat the support is longer than required as you can adjust it(you can cut it too long more than once,and too short only once)the shaped end fits in the space under the seat of the bike and infront of the rear mud guard. It can be left out altogether.The seat back then needs to be lent back ,or removed as the sidecar is cast as an empty side car.
The gunner goes into the seat before the gun is added. This helps if you cut the leg of the gun too short or choose to remove it altogether.
When they were first released a line drawing instruction was inclued.however people that were given bikes for blogs etc reported back that they weren't required.
I'll make a new set and ask Simon to post them on the web site.
In the meantime if you pm your email address I'll send you some photo's of how to put it together as I'll be making a set to go into a garage next week,