Units and a selection tool

Hello,
I found the current unit system (m, ft, mm)
is not sufficient for the cab building, because
most parts in a cab is on the order of 0.5mm-
20mm, so it will make the work easier if we can
have a new unit of ‘cm’ in the system. Or, user
can define their own unit system.
The other thing I wish is a tool to save
the selections and user can save and load the
selection. The current version can show the
previous selection only when the operation
is cancelled.

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