I'll be interested to hear how it runs with the XW.
Interesting collection of photos, thanks for the links.
My SL2 set is bolted directly to a solid concrete block which is perhaps 6" wider than the base of the genset all around, sits on the subsoil clay, and stands about knee-high. Very heavy and stable, and easy to work on. The shed floor around the foundation block is fine screenings.
The 8/1 belt-drive set sits on its original Lister cast-iron base. This in turn is bolted to and fully supported by a heavy fabricated 4" steel RHS frame.
Between the engine and the cast-iron base is a stainless steel oil drip tray with a drain spout at the end.
The steel frame sits on a heavy steel skid fabricated from the same 4" RHS, but is isolated from it by 6 large industrial rubber machinery mounts.
The engine will run quite happily with this whole assembly just sitting on the ground as the rubber mounts absorb all the vibration. When installed, the skid sat on a floor-level concrete slab with a small 2" x 3/4" steel frame bolted to the concrete. The slab had a winch achor point cast into it. When originally installed at the ski lodge, we could winch the whole skid out of a trailer, up the side of a hill through the scrub (perhaps 25m) and into the motor shed. The frame bolted to the slab guided the skid into position and a steel pin was dropped into place to prevent any possibility of the skid gradually "walking" around. All that remained to do was connect the fuel line, exhaust system, and plug in the electrics.
When it was removed we just reversed the process. It was winched out and down the hill onto a trailer.
It still sits on the skid so I will be reinstalling it at home using the same methods.