Hi Azelor.
I'm in Canada but originally from the UK where we still use weirdo Imperial systems like feet and inches, stones and pounds etc...LOL
I never thought about the impact fur following your guide. I'll switch to metres and with your above advice, I will stop defining elevation at 6000m.
When I actually get to rendering the map I'm not going to be going for an atlas style like Pixie or Charerg (way too intimidated by the insane amount of work and results that they have achieved). I will either go for a painted style or a classic Jonathan Roberts style map, not decided yet.
Regardless, just need enough detail to figure out the climate