VT-d is not an absolute requirement for any OS. VT-x is required for HVM's, like Windows. https://www.qubes-os.org/doc/system-requirements/
eth0 is auto-configured. The Internal Network adapter (here eth2) must be manually configured.
The scripts are well-commented. Read them and change what makes sense. To be honest, best idea might be to re-build the whole thing now that your adapters are working.
I know this isn't what you want to hear but from my first post in this thread:
Physical Isolation at this point is really a DIY / experimental project and https://www.whonix.org/wiki/Support#Free_Support_Principle surely applies. Snowden, the noob, used Tails so you could do worse than going with one of the other Whonix platforms.
If you are willing to invest time & energy to make Physical GW work, you might want to take a step back and read a bit about linux networking in general. Debian wiki & doc is a great resource:
PS: Rebuild one-more time paying very very special attention to the networking verfication step I linked. If your cards are lined up properly, it all might work without touching a thing.