Just thought I’d do a little follow up on this. The initial damage pictured in the linked post was caused by the differential trying to exit the case after one of the spider gear shafts disintegrated.
After initially being told otherwise, we received a call informing us that no, Porsche no longer supplies bellhousings for the G50, but that they would be happy to sell us a complete transaxle for $11,000+. That not being an option, we bounced the issue off some Porsche shops that we’re friendly with and were directed to a company in Colorado called G-Box. As the name implies, they specialize in these and has successfully repaired and welded similar failures, so it was shipped their way. It’s finally going back in the car now, and looks like this:
Here’s hoping it holds!