The squad list sheet from https://www.fantasyflightgames.com/en/products/x-wing/doesn't have the new obstacles (yet?).

I guess I can just write on the sheet if I want the biggest one and maybe the "moustache" but then what about the others?

Just trace the outline of the obstacles you're using on the back of the sheets

Threadomancy I know (burn him!!!) but has this issue been fixed yet?

Yet Another X-Wing Squad Builder has outlines that you can print on your list. Great resource.

https://geordanr.github.io/xwing/