RW-1,
Charles Kaman might shudder to hear;
"... a model of a Kaman intermeshing?" 
This model, with its rigid hubs and two blades per rotor, will experience (or has experienced) very high vibration during forward flight.
Trivia,
A close-up of the hubs and swashplates is interesting. They have set the phase lag at approximatly 45-degrees. If the craft had basic teetering rotors, the phase-lag would be 90-degrees. If they were able to produce 'absolutely' rigid rotors, the phase lag would be a theoretical 0-degrees.