CONSTRUCTION DATUMS
Created by: Exxion
Use them It's much easier to just use them when first adding construction to an object than it is to convert it from whatever variation of snowflake construction code you used to construction datums. Plus, it makes adding general construction-based features much easier.
If you'll excuse me, I'm just going to go stare at airlock construction code and weep. (I know that probably predates construction datums and is thus excusable, but it's still a great example of why you should use them now)