I am going to be making a vacuum frame press for my veneering work. Roughly 4'X5'. The platten top will be 1/2" mdf with a 2.5" thick Baltic Birch plywood frame underneath. Due to the size of my shop the press will be on horses while in use and hung on the wall for storage. My question is do you guys think that the 2.5" frame is thick enough to prevent the frame from flexing while in use. or should I make the frame thicker? I look forwar to hearing your thoughts. Thanks in advance.