After some hammering, trimming, more hammering, a bunch of finish planishing and finally some more trimming, the cover fit fairly decent.
I really like using this cloth wire loom. It has great abrasion resistance and a fairly high temperature rating. Plus, it looks attractive and fits with era of the vehicle. The majority of the time associated with wiring is actually taken up by sorting out the loom. Sure, it's definitely tedious work. However, once its done, it'll last for a very long time and provide excellent protection to the wires.
There are still several clamps to install but it's nice when a harness fits well enough to hold itself in place...
