Create a bucket type vacuum chamber and a wire rack you can drop down into it with multiple levels for the slabs, surround the bucket chamber with a couple 5 gallon heating jackets w/ adjustable temps put a heating mat below…
I built a few 1.9 cu ft vacuum chambers with heat surrounding the whole thing for a few hundred bucks each, forgot the exact specs may have posted on here before
I believe I used the 15 gallon bvv vac chambers when they were still making them