Overlapping rotors, not intermeshing, right?
(Two) 2 bladed rotor heads
Overlap blades less then 65%
Stack one higher by 3 feet or so depending on blade flex etc
The center portion will be retreating side
Reduce flapping and encourage dyssemetry of lift on each rotor
On lower head 90 degrees from blades fit two weighted stub blades that can lead/lag (tuneable)
Both xmsn assemblies mounted to allow left/right, fore/aft and vertical dampning (tuneable)
Use a third prop mounted aft and at the mean average of the discs for thrust, yaw control and to keep the disc setup above etl.
Install a very large ballistic recovery parachute.
Let me "hold your watch" while you test fly it.
Working on my second cup of coffee now !