3D modeling is performed by actual measurement with a vernier caliper, etc., and errors are corrected through the process of actual mounting testing after printing. Sometimes this process is repeated several times.
I work as a 3D animation concept designer. And was planning on further designing with some files from you a rehousing for the 24-105 and or 24-70mm. Would be amazing if that project will be finished some day.
Designed for lenses that protrude from the back of the lens, such as Biogon and Jupiter-12. In fact, there are few lenses like this except for the Leica M mount or Ari PL mount, so I think the other mount types added will have no advantage other than enjoying a different look. :(