I love your cabinets! Consider putting your plywood on 4 cabinets and then on the other one separately. You can push it to the end of the 4 or use it next to your sewing area for pressing while sitting down. I covered a board for this use and I really like this convenience for spot ironing. 3/4 inch plywood is very very heavy. You might want to consider 1/4 or 1/2". Just a thought or JAT! My own acronym. Good luck! Be sure to show us your completed project. Yolanda Wood River