Thanks for your answer,
I actually tried different projections to have an idea of the results I can get. The overall process is fairly simple but a small error when drawing a line can have severe consequences and mess up the whole map...
There is still some big issues with specific features such as round walls and, by extension, everything that's round. But I guess I should practice more to get a hold of it.

That video is really interesting to understand those different projections, thanks !