Really? Your experience with that forum must be different from mine. I wouldn't recommend the sidecar.com forum to somebody looking for technical information on a proposed custom sidecar build.
For example, take a look at just Page 1 of THIS THREAD
. There's more technical info about building a leaner on that page than I think you'll find in all of the sidecar.com forum.
I have driven both a semi-leaner and a full leaner. I got into sidecars when our son told us we were going to be grandparents 12 years ago. I wanted to convince my daughter in law to allow me to take them out for a ride!
I first installed a Velorex fixed rig on my old Honda Silverwing. It was tricky to handle (don't let go of the handle bars!) but was fun to see the look in onlookers eyes when I would lift the side car on right wheel turns and run it on two wheels.
I then looked up the two sites mentionned above and decided to convert my sidecar to a semi leaner. I had to extend the attachments and lower the rig to avoid leaning into it on right hand turns but the ride was definitively better. I still ride this rig every year at my summer home.
Then I got a Fleximum that I attached to my K1200LT. I even colour matched it and changed the locks so that I only need one key for bike and rig. Although relativelly heavy when fully loaded, this is a lot easier to drive. I can scrape the pedals if I drive agressively. Because of the offset weight, it pulls right when you accelerate and pushes left when you brake, which takes a little getting used to, but when you reach cruising speeds and hit the cruise control, you can let go of the handle bars and drive it by the seat of your pants. The missus doesn't like this much though, I wonder why?
I have attached a few pictures for all to see, This summer I moved the Velorex rig to a CX650E that I brought back to life,