I am hardly an expert, actually very far from it.
Some TT designs use aluminium as a plinth material.
However sandwich is kind of new to me and might or might not be beneficial. It is hard to tell, at least from my point of view. I am working right now on the plinth for my Lenco. Materials used are premium MDF 3/4 inch and Baltic Plywood which is better then Birch in my opinion (13 layers in 1 sheet ). This plinth is my second one, so my experience is very limited. My first one is made from Bamboo BB, walnut for arm board and Mahogany motor stand.
I also didn't find a lot of support but took a chance and it worked just great. Bamboo BB is about 10 times harder then maple BB and it sounds GOOD (I don't want to put to much sugar in your tea - but it sounds GREAT ). What I'm trying to say try it - my advice, make it heavy (40-60 pounds ). You can also incorporate a dedicated TT stand & platform for even better performance.
I would only recommend that you use top & bottom layers out of Ply. or MDF + separate arm board(s).
Keep us informed on the progress and your final design.
Good luck on your project.
Mariusz
Some TT designs use aluminium as a plinth material.
However sandwich is kind of new to me and might or might not be beneficial. It is hard to tell, at least from my point of view. I am working right now on the plinth for my Lenco. Materials used are premium MDF 3/4 inch and Baltic Plywood which is better then Birch in my opinion (13 layers in 1 sheet ). This plinth is my second one, so my experience is very limited. My first one is made from Bamboo BB, walnut for arm board and Mahogany motor stand.
I also didn't find a lot of support but took a chance and it worked just great. Bamboo BB is about 10 times harder then maple BB and it sounds GOOD (I don't want to put to much sugar in your tea - but it sounds GREAT ). What I'm trying to say try it - my advice, make it heavy (40-60 pounds ). You can also incorporate a dedicated TT stand & platform for even better performance.
I would only recommend that you use top & bottom layers out of Ply. or MDF + separate arm board(s).
Keep us informed on the progress and your final design.
Good luck on your project.
Mariusz