Check out this cool bike George designed and built years ago (thank you George for sharing this!)

this was a OEM Harley swingarm frame, and George replaced most all of the tubing. 

Dropped the tubing below the seat andd raised the steering neck and increased the it's rake. 

Extended the swingarm and moved the lower shock mounts back. 

Dropped the the seat a little, custom built the rear fender rails and curved them to match the rear fender. These thing put the rider as low as being on a rigid frame but road like a dream.