Infusion seems to be the way to go, but you only get one finished face with peel ply texture on the other. What's the best way to get 2 finished faces? I tried a small 150mm square by just clamping 2 peices of aluminum tooling plate together and it worked perfect with really good fiber to resin ratio, but I need some larger 500x500 plates (2mm thick). I could use 2 plates of glass backed up by something else like mdf maybe, but I imagine just clamping around the outsides is not going to squeeze the middle well enough unless I get tricky with the clamping. Maybe some thick peices that span across with clamps on outside to hopefully put enough pressure in the middle. 
Any other good way to do this other than clamping? If clamping is the best option, what's the best choice of clamping plate material and method for doing it? 

Another question about carbon panels, when doing just a solid carbon infused panel, no core, let's say 2mm thick for example, what would be the best choice for layers on the lay up? I understand how to orient weave depending on what direction strength is needed in, but what about heavier weave vs lighter weave vs biaxial? The couple of panels I've made were just 8 layers of twill 200g weave. Looks like it would be far more economical to use some biaxial for the inner layers since it seems cheaper for the thickness, also would it give better stiffness since there's no kinks in the fiber like weave? Furthermore, if it is a good idea to use biaxial for inner layers, how does different thickness affect strength? I could use 200g twill weave for outer skins, then 4 layers of 400g biaxial, or 2 layers of 800g biaxial. The 800g is more economical, but how does the 2 options affect the lay up?