I've been planning to do a PC workdesk with solid wood edgebanding and a laminated top. Plans call for MDF cores to be used for all the laminated parts. I was thinking of substituting baltic birch for the MDF to make it less prone to sagging. Is this correct thinking, or does the ply have problems too? I believe the plans were calling for 3/4 or 1" MDF. The ply should end up a bit lighter to. Hate to think of moving a 1" sheet of MDF around!