[ERA Chas]

Basically yes but you need to have a perfectly flat surface to check your progress. Before you start, lay it on that surface and mark the areas that are not touching. Be patient, and use either a strong light or feeler gauge to check the gap or flatness as you go.

I'd make a cardboard template(s) of the tray and place it in the crankcase opening and keep trimming the pickup location. Allow for the curvature where it bends around the crank and be sure to locate the template to a few perimeter holes so you put it back correctly each time you check. Then cut the steel tray to match your template.