I rather like transparnt covering, too, so I'd have to do the traditional Rascall patern maybe with transparent green.
I have a DLE 60 twin in my Telemaster, which is way overpowered, but it balanced the plane and I plan to tow and eventually set it up for floats.
Transparent orange and white.
I would think the 57cc Saito twin would be neat on the big Rascall. It just seems like it should have the sound of a four stroke.