The original Dan Santich 80" UltraHots was designed around a Quadra 35. It took less than 48 hours to go from a pencilled sketch to a flying plane with a Quadra 35 on the nose.

The Roto 35 is a lot lighter than the Quadra and would make the UltraHots really perform well.

Plans are available somewhere, and you may even be able to find a kit.