The clams do extend a bit further down the tub, but replacement sides at the front would get rid of most of the mounting points.
Alternatively, if you have a look on eBay, there's a company doing vinyl strip kits that includes side stripes that would probably cover some of the marks/holes. (Obviously there's full on wrapping too for anything really bad.)
I'm not sure if you have interior side trim panels and outer tub aluminium panels, but you will need to either remove the trim panels and cut some access holes in the outer a, or just cut access holes through both, to get at the two sets of securing nuts on each side, nearest the back of the car. (Assuming they've been fitted as per build manual). If you've been very lucky, the builder may have fitted captive nuts, in which case, no trim removal needed! (Where's that smug icon, when you need it!)