Replacing degraded foam in Anvil Case for Alembic Series I

I have an Alembic Series I from 1977. I bought it with what must have been the original (huge, heavy) flight case. The case is still structually sound, but the form-fitting foam has degraded to the point where it's just crumbling to pieces.

My plan is to remove and scrape out the foam and install new foam, cut it to fit, and then cover it with some velvet material similar to what was originally installed.

Has anyone done this kind of resuscitation to their case? I googled this and didn't find any promising links.

Does anyone know of a good source for the best type of foam for this application in the USA?

Is there a particular density or chemical composition that I should look for or avoid?

Any tips about cutting out the cavity for the bass? Obviously I can use the existing foam as a guide, but I want to make sure I get a snug fit without creating any stresses on this bass. After searching, I did find this TB thread

I'd appreciate any tips, links, advice, or snickers.