F-f-f-fortuitous topic !

Left to my own devices, I thought about using freezer wall polystyrene foam, some of it comes backed I think.
Lay this on a galv C section strongback with intercoastals, the kind you build portal frames for garages out of. Mostly just on the floor but leveled with packing pieces.

The polystyrene foam has to have the sections bonded together and be coated or it may melt with other resins. I was going to look at laminex bonded to it but have been thinking about just flow coated resin.

Big bits get bagged first, and as space requirements squeeze things up cut the table down to more manageable sizes, which sounds a lot like where Gardener is at

I guess when it comes down to it, people are watching the cost that goes into the table, space available at hand, and the success in use.