It would be a blast to have the model as an App you could run on your phone, especially if you could add and change parameters as new information and statistics come in.  For instance, back in 72 I doubt anyone projected how far the global fertility rate would have fallen by 2024, and how fast that drop is accelerating. Also current data on CO₂ content in the atmosphere or aquifer & soil depletion rates.  Nor I think was there a way to factor in substitution of new technologies such as the growth of Solar PV and Wind power.

Unfortunately, my own skills don't fall in this area, so besides suggesting ideas for what it would be cool if it could do, I am of no use to this project.  I can see where you would get completely obsessed by it though. lol.

What about incorporating AI into the model?  Maybe there would be a way to set it up so that an AI subroutine was constantly searching the net for data that would improve the accuracy of the projections?  You could turn it on every day and check to see how the latest Collapse Weather report is!  "Today will be cloudy with a chance of extinction by 2100 improved by 2%.  Occasional dry periods as your taps run dry from noon to 4PM."  lol.

RE