Jeff, You are absolutely right. Do it right in the first place. In my case, I built around the walls, and made a 1/2" miscalculation on the height somewhere which affected where the two ends meet for my future lift up bridges. I didn't even notice it until I made a temporary lift out plywood piece with track on it. While sitting at the computer in the next room, I noticed the lift out looked crooked. Sure enough one side was 1/2" lower. I could have left it that way, but I wanted level bridges. Fortunately the Mianne topped with plywood at that area was easy to jack up 1/2". I found the place of miscue and leveled it up. All is now swell!
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