slider sequence
We're at that point on our 9A slider. Yesterday, I installed the delrin blocks at the rear of the frame and sure enough, my imperfect drilling altered the height & position of the frame. Fortunately, delrin is cheap and the side skirts are not installed so I can still adjust.
Based on our experience, skirts & trim go on after the slider is completely locked into place with rollers and blocks.
Hope that helps.