One important thing to do right away is have a low res/poly conceptual drawing or model for everybody to use a reference.
I thought I read that you do something along that line professionally, ConnieKat8?
It doesn't have to be anything extravagant, just enough to get everyone working in the same style. Also allows for someone to 'sign off' on a particular piece of work, avoiding duplication of effort (member A will work on Building X, Member B will work on Building Y, and so forth).

What target app. are you making these for?

Friends don't let friends use booleans.