The best 3/4" maple plywood I can find locally is either B-1 combination core, or A-1 MDF core. I will be using screws for various parts, and would prefer the combination core for the screw holding power. The shop has 1/4" A-4 MDF core, and I'm wondering if it makes sense to make my own combination core plywood by sandwiching a 1/4" non-maple plywood (Baltic birch?) in between the 1/4" A-4 maple MDF core sheets. Does anyone have any experience doing that?