This video displays the demo and program for Model Universe from Arnor.
It might really slow down with the more complex designs but remember it dates from 86.
Instead of watching it on your phone/laptop/PC I would highly recommend using 4K Video Downloader to download the file from YouTube as an MP4 (takes minutes) and watch it on a large screen TV.
https://www.techradar.com/uk/reviews/4k-video-downloader (https://www.techradar.com/uk/reviews/4k-video-downloader)
https://www.youtube.com/watch?v=myGshyU3-5A&t=224s (https://www.youtube.com/watch?v=myGshyU3-5A&t=224s)
Links:
http://www.cpcwiki.eu/index.php/Model_Universe (http://www.cpcwiki.eu/index.php/Model_Universe)
http://www.cpcwiki.eu/index.php/Arnor (http://www.cpcwiki.eu/index.php/Arnor)
Reviews from Amstrad Computer User and Amstrad Action:
https://archive.org/stream/AmstradComputerUser200786/AmstradComputerUser/AmstradComputerUser26-0187#page/n81/mode/2up (https://archive.org/stream/AmstradComputerUser200786/AmstradComputerUser/AmstradComputerUser26-0187#page/n81/mode/2up)
https://archive.org/details/amstrad-action-016/page/n41 (https://archive.org/details/amstrad-action-016/page/n41)
Nice! Would be interesting to compare this to CPC Giga CAD.
I think Model Universe might be a suitable program to be used with Breaker.BAS, especially as its file format was not compatible with anything else on the CPC. I'll have a look at that next time I'm in Glasgow.
Link:
http://www.cpcwiki.eu/forum/applications/screen-capture-utility-from-1987-by-alistair-scott/ (http://www.cpcwiki.eu/forum/applications/screen-capture-utility-from-1987-by-alistair-scott/)