MichaelN: This is late response and also a sidetrack when talking about your actual problem.
As hansmex showed, Sketchup is handy tool to solve this kind of problem with SKP-files downloaded from 3Dwarehouse.
Today Trimble seems to keep older Sketchup-versions hiding in the shadows but I just found Sketchup Make 2017 from https://www.sketchup.com/download/make
When clicking link, selecting proper choises and clicking Submit-button you should get pop-up-window that offer possibility to save file sketchupmake-2017-2-2555-90782-en-x64.exe.
File size was 148 MB. I have not installed and tested it because I have used this version since 2017.
So: Sketchup Make 2017 seems to be still available if you or anybody else want to use this versatile 'gues what happens now' modelling software.
Seppo
