Reply by TCCcabinetmaker

you are’t supposed to cut the panels to match exactly, you are supposed to leave soem space. I use a product called space balls to space my panels in their dados, so that they don’t move, but also won’t crack the frames, cheap, but the only source I have for them is a company from california called cabinetmaker’s suply, which is online, but the shipping usually doubles my cost on them :/

-- The mark of a good carpenter is not how few mistakes he makes, but rather how well he fixes them.