Finally got some pictures.
The first shows how the tires were assembled. Used 3/8" threaded rod, top and bottem to hold them together
This shows the rubber roofing which seals the bottem of the tire in case I want to add something later to change the dampening characteristics. The tires will be bedded onto the rubber mat on the floor and held in place with 1/2" expanding anchors.
The pieces leftover pieces of tire were cut to fit the holes and secured so the tread would stay perpendicular to the floor. then the hollows were filled with shreaded rubber and covered with membrane to support the concrete while it hardened. The form is 1/4" luan which bends quite easily when wet.
The vertical pipes fit into holes drilled in the tires and allow me to add material in the future if needed, They also locate the concrete on the tires. There are two 5/8" threaded rods which could serve as jacking points in the future. I had been thinking shock mounts too, but they won't be necessary. There will be another layer of reinforcing added 6" above the one shown. The concrete acts as a bridge (with a jumping jack pounding it) in some respects and needs to be really strong.
Twenty 80# bags later. I used fiber reinforced mix with an extra scoop of portland per bag. The wood frame on top held my anchor bolts in their proper places. I had origionally planned to strip the entire frame out and fill the channels left in the concrete with lead to bed the frame on but ended up going on top of the wood. Seems fine so far.
A day later. BTW, wvo makes a fine release agent in a pinch
The engine hoist I'd hoped to use was not up to the task. So....1/2" at a time....
Getting there. The fuel tank is suspended on a spring with index marks to show how full it is. I was surprised at how quiet it was inside, except for that damn idler gear. Outside, with no muffler, it sounds like a steam engine. Thats without a load, still have some plumbing and wireing to do before I can load it up.
Side view
Many thanks to Geno for the hours he spent edjucating me in computer operations and the use of his web site.
Bill