DIY Kitchen Island on Wheels: Attach the Middle and Top Shelves
Cut the middle plywood shelf to size and drill 3/4" pocket holes into the undersides. Attach to the carcass with 1-1/4" pocket hole screws. Add the trim with brad nails and pocket hole screws. Check for level.
Cut the 1/4" plywood sheet pan dividers to size. Dry fit to see if items will fit. The stand mixer should fit on the bottom shelf, the sheet pan dividers should easily slide into place, and the top shelf is designed to fit standard rolls of aluminum foil, plastic wrap, and other food storage items.