CLD is widely misunderstood. Might I suggest a bit more research before concluding that you have implemented it . . .
Not as fun as the other definitions. I'm surprised it's equations still, i'd have thought FEA would give better results, and certainly allow for iterative optimisation of a design, but hey, i'm a software guy, and every problem looks like a computing problem to me!
I’d be looking at Valcromat for both speakers and plinths, it’s incredibly dense and can be worked like MDF and finished really beautifully.
others might have more experience of it, but the weight and density impressed me!