First of all let me say that I currently own and have a very small taste of Mana at the moment (P2 Reference wallshelf for my LP12). I'll be on the lookout to add more when funds allow as i quite like the stuff, probabbly a Stage and a 3,4,or 5 shelf Amp Rack, whichever i can find the cheapest s/h. There must be a point though where the benefits start to diminish.
I can see the logic of siting an LP12 TT on a light, strong, rigid platform, with a decoupled shelf. My LP12 users manual says as much and as such the Mana wallshelf fits this description perfectly, although so do several other designs out there.
I can see that each layer or phase of Mana is a light, strong, rigid structure with a decoupled shelf in its own right. When you start to mount it all with multi layers, and to a colosal hight as some folk do , doesn't the light and rigid aspect of the design start to diminish fairly rapidly ?
Also whats underneath you floor Bub, talk about the stilleto effect , your bottom spike must have some pressure underneath them

. ( stilleto heals the bane of my life, they destroy the light compsite floorboards in Aircraft and muggins here has to repair/replace them ). I was a bit worried about the weight when i installed my 55 gal Aquarium so i reinforced the underfloor area, this was spread over a large area to, it still started creaking when i filled her up though.