I am going to look in to the bubbles a little further, but my gut reaction is that it's not going to be a problem. To be honest I didn't notice them in person, I don't know if it was the lighting or my camera, but they look considerably more pronounced in the photos than they do in real life. Also, the silicone will all be hidden by framing, so I'm not really concerned with the aesthetics.
Had a little pow-wow with the project manager and his main site foreman today and we talked about both self leveller and the spray foam, and what would need to happen to re-do the whole tank. One way or another, there needs to be a minimum 3 inch thick sheet of plywood under the tank to anchor the doors and the cabinet framing, which will still need to be made by gluing thinner sheets together. There's no guarantee that the second attempt will come out any flatter than the first. It would be an absolute last resort option.
So that leaves us with self leveller or spray foam as a first choice. After talking about it, we ruled out the self leveller because the gap between the bottom of the tank and the plywood starts out really, really tiny, and is only really exaggerated on the one side. There's a good chance that due to air getting trapped/liquid leveller not filling all the right places, there could be large bubbles that get trapped underneath and the leveller doesn't compress at all. So we're going to try the foam route because it can be applied using a long hose, and if there are some imperfections, it's slightly compressible.
fingers crossed.
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