I had a Buell about 10 years ago , a tube frame M2 ,best handling bike that I've ever ridden and full of design flaws . Yours at least has the shock working the normal way ( compressed by road bumps ) . Mine used the head steady mounts to hang the engine off ,that got replaced by a solid Billet mount from the US after the original one snapped . Did two drive belts and yes the engine vibes could be a bit intrusive around 2500 down to 2000rpm when using engine braking but other than that a really enjoyable ride .
One problem is the needle roller bearings in the gearbox out put shaft ,if the bike is left ,say overwinter on the side stand , the bearings are out of the oil and corrode ,there is a conversion ,look up Maz Matsell on the internet , it's just a grease nipple in the end cover but it cures the problem .