Currently, each gold part has 100 Cost which means 3 gold units totals 2700 Cost. Accounting for the 30 Cost reduction from 3 LVL 10 pilot proficiency, this leaves 2670 Cost with only 2600 permitted at max level. So around 4 parts out of 27 will not make gold. With which parts will you be able to stomach that? Multiple picks are permitted. I know it may depend a lot on actual builds, so this is a bit of community engagement fun.