Hi Paul!
“A huge endeavour, a great effort.”
In this case, I think you should invite more people to join you in this big effort.
There are so many things in the scope of this for just one person.
Certainly you had great ideas designing a fictitious model 7 and the new OS,
one that could use those new hardware features - something I used to think
about when I was a 1130 programmer (I used to look at that quiet DM2 console
and think "why this machine doesn't talk to the operator like the IBM/370?")
Me and many people would love to see how this would work, even if simulated.
Best regards.
Claudio