Re: Engine vibrations bad for the frame?
The damage to the frame will be a result of the engine being able to move at the points of contact. If the engine is bolted solidly to the frame, no rubber, then it cannot move, hence, no wear. Yes, paint damage can result and some have wrapped the contact points with electrical tape, just enough to protect the paint, not layers and layers.
As I stated above; the more solid the engine is mounted, the less you'll feel the engine vibrations.
'm not in favor of wood as an engine mounting material. It will compress over time and allow for movement/vibration. Try to get rid of the wood and opt for metal heavy enough to hold the engine securely.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"