I'd definitely stay away from sliders in a wheelwell. You can get the same motion from a scissors jack or lazy tongs, or a simpler, equally suitable one from single links.
The bump stops compress, but rarely. You might want to ignore that, except for damage control. On rebound, momentum can carry the wheel past static, no-load position.
Personally, I'd continue the skirt upward, overlapping the fender, hinge it at the hood line, and just let the tire rub to push it out. The spring tension holding it closed might be varied with speed.
I think most add-on skirts, front and rear, should overlap the fender and create a new line, rather than trying to work with existing styling. Front skirts would need the least clearance in use if they were in a frame that reduced the width needed to move.
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