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Looking good. There are many differing approaches to the roll off mechanism. I understand the desire for a captive channel but you will still need tie downs somewhere. If your channel is sitting on the top plate they can still pull loose the plate. I used metal tie straps to secure the top plate to the studs and the studs have tie downs at the bottom as well. I just used galvanised angle iron as my track. As long as you space them exactly the distance of the castor wheel track then they will never run off the rail so to speak. So I only have the vertical side of the angle iron on the outside to hold the castor in. The roof can't move inward because its held in the track by the angle iron on the other side. Channel is good but I could not find a bearing solution I was happy with at a low cost.
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