I've "made" a table with plywood. Plywood thickness was 15mm. Here is a model (one remark - the 30mm distance is 85mm actually, but it doesn't matter at all for now). I've used 40mmx40mmx2mm corner braces for all the plywood sheets to get them together. My "table" is varnished with yacht varnish.
The obvious problem I didn't expected was that 15mm plywood is really thin, so my table top sags ~1-2cm up and down.
I'd like to ask you about possibility to reinforce the "table".
My thoughts for now:
decrease distance between lateral ribs from 1465mm to ~1400mm (and cut down rear rib as well);
increase thickness of all the ribs twice - I'm going to get the same 15mm plywood, remove the varnish and glue each pair of plywood sheets
fasten additional corner braces
Can I go with that, or there are some better ways?