Progress was made on the cabinet. I got it sheeted.
And then after taking suggestion on doing the top I added some strips of plywood to give the thing a crown. Its three layers in the center, then two, then one, then 0. It gives it a rise of 1" in the center. I sure hope this works. They are 10" on center. I am hoping that the 1/2 PT ply (yes David it is the thinner stuff but I am hoping it will flex) will bend over it. If not I will have to lay it with a seam down the center.
once the PT ply is down I will use the rubber roofing/pond liner materiel as one sheet with no seams over the whole thing. Now on the edges I will apply 1X2 PVC blocks with gaps and then a 1X2 solid PVC piece creating a gutter to hold the ballast. I will use window screen material to screen the gaps to keep the ballast in but let he water drain. The whole thing if goes as planned will slop in three directions. The idea then will be to fill it with ballast (1 1/2" deep at the edges and 1/2" deep at the center) and then the track will free float on that. I think this plan should work won’t it.
Now under the bench Iwas going to build fancy shelves and what not but I decided to leave it the way it is. I plan on building car trays anyway and this leaves free space to place buildings and whatever.