Did not realize the cofounder of Interplay also ported Doom for the 3DO. Looking at Fabien Sanglard's Doom Blackbook (https://fabiensanglard.net/b/gebbdoom.pdf), I just now noticed that Heineman actually provided some behind-the-scenes promotional photos to that book!

Looks like the link from Hacker News doesn't work, but if you navigate to the PDF from the blog it does. Post is here: https://fabiensanglard.net/gebbdoom/index.html