Thanks for the replies so far.
I already have a roll of damp proof course and roofing felt to hand by the way, as my garage floor sucks up moisture when it rains, a pain but there you are.
So build the wooden frame with steel sub-frame, but isolate the whole thing via rubber mounts - ?
So... (and I don't want to start another big argument here) are we saying that despite Lister recommending solid concrete mounting, the best way forward nowadays is via resilient mounts?
Will concrete mounting result in low frequency vibration 100% of the time?
The only reason I don't want to pour the concrete as per Lister instructions for now, is that:
1) I may be moving house in a few months
2) ...so I will only be running weekends for a few hours, until we move.
The garage *is separate* from the house, but I need to be careful about neighbours (and their delicate China teacups hanging oh so precariously off their Welsh pine dressers).
I hope to balance the engine anyway before running - one thing i will be doing is having the flywheels mpi tested for cracks.
PS - Biobill, I don't ride a Harley, but I do ride a VTX, hence the name!