I add wedges (resin remaining parts from the cleaning step) to improve the gluing surface and clog open gaps that appear.

This is then covered with black (spray can).

And the bottom part is installed

The parts (top/bottom) are not really symmetrical (right / left) , and upper and lower plates of the Stardestroyer don't even have the same angle themselves.
So, several runs on the belt sander were required to have a good fit.