Basically make buildTime = buildCostMetal for all units, then use workerTime of facs/engineers to control construction speed/drain.
- Easier to figure out what buildTime to assign to each unit.
- Can change factory build rate/drain with just one value.
- No more need to have different unit defs to build at different rates depending on fac.
- This would change things if facs aren’t constant-drain (I think they are though).
- Would affect reclaim speeds (not sure this is significant though).