Hah. I have memories of being a grad hire working on this project - mostly to fetch tea and follow the directions of my betters - but still, it was an impressive thing to see.
I sat next to a guy who worked on something called Jacket & Tie. I don't remember which was which, but the essence of this was to compile VAX32->Alpha assembly, then run that on a big ass VAX (an 8000? It's been a while) that had loadable microcode(!) enabling it to emulate a very very slow Alpha. I think I recall hearing that the first successful boot to login prompt took ~24h on this hardware.
I ported the RAD50 6-bit character set library (so you could handle 6 characters in a 36 bit word file produced by ancient TOPS20 boxes from the Marlboro Computing Company), written in the even deeper past by my then boss when he had been a whippersnapper. It was in PL1 I think.
I ported (i.e. changed the build files to target Alpha rather than VAX32) the badblock utility, and tested it with an Alpha work station, a SCSI floppy drive, a box full of unused 3 1/2 disks, and a paperclip to scratch the surface of each one before initializing it.
I had some madly brilliant colleagues who ported millions of lines of hand-tuned VAX32 assembly, a boatload of BLISS32, and oddments of other languages.
I used to have a numbered super-secret copy of the project plan but I think it went in the dumpster decades ago.
I had a terrible time, and left with my self-confidence shattered having spent several years achieving not much, but watched some astoundingly competent colleagues do amazing things at a time when Intel's chips were topping out at 33MHz and Alphas were planned for 1GHz. I wish I had made more use of my time there, but boy, I'm glad I got to see some really top notch engineers at play.