Hi RD, in that 1.5 meter x 1.2 meter overall size are there going to be any details in it that are at the 1mm size?

Because that's a pretty tiny distance in proportion to the full object.

Maybe having one grid block as 1 centimeter would be a good setup.

You could do that by having these settings:

Grid size = 10mm
Snap size = 10mm
Grid sections = 150

- Michael