I’m sorry for the slow reply. I thought I had replied last night, but I must have failed to tap the Submit button.

Lazyman, the lumberyard kiln dries the lumber to 7-8%, but their stacks are in a non-climate controlled metal building, and I don’t know how the moisture content changes there. And who knows how it changes in the garage. It sounds like I need to buy a moisture meter. Do you have any recommendations for a good one that won’t break the bank?

Barb, I had wondered about sliding a thin piece of wood inside the track as a way to attach the cover in a removable way. I hadn’t thought about using it to strengthen the track. I suppose every bit helps, so I will think about this more. Maybe I can use a metal miter bar (the kind designed to slide inside T-track).