I decided that this thing may be cooler with a sidecar, specifically a leaner. I was doing a bunch of reading, and was going to modify my velorex 562 to be a leaner against my r90/6, but I decided to go with this instead.
Part of what I wanted to do was be able remove the leaner sub frame quickly and easily and have it look as though there was never one on the bike. This is what I came up with. I added a simple cross member under the front of the motor with two bungs threaded for half inch fine thread bolts. I also drilled the existing cross member for the same bungs.
From there I stated making the leaner subframe.
With 4 bolts, you'll be able to pull this thing off and I doubt anyone will be any the wiser that it was there.
The connections/pivots will be 3/4" chromoly heim joints.
Not sure that I'll go with this, but it was worth a mockup. I actually started this frame years ago to be a single wheel trailer for behind a dr650. Sold the dr650 and here we are. This hacks job will be to cart my 3.5 year old son around on back roads and go for the occasional "beverage fridge restocking run", so it's not a real serious, big miles project, just a fun addition.