I think its a good project, but I'm afraid I have a couple of small disagreements with what you've proposed.
I feel its obvious that the standard UWP procedure directly targets worlds in the habitable zone and would not work effectively in the other zones. As a result, atmospheres assume breath-ability and hydrographics assume liquid water. This pretty much means that they are useless for inner, middle, and outer zones.
For size, you could use the typical method but say its the radius in km. A '10' would then give a world radius of 10,000 km which is a world diameter of 12,420 miles
I feel that the atmosphere code should refer to pressure only and then make note of the composition separately based Jean's escape. As oxygen is likely a product of life, and life generally requires liquid water, then a breathable atmosphere is really only available in the habitable zone except in odd, rare ( ref generated? ) cases. Iirc, Book 6 used hydrographic% to estimate percentage of oxygen in the atmosphere.
I also feel the hydrographic% refers to liquid water and thus ice shouldn't really count as outside the habitable zone even if there are subsurface oceans. But that's just my opinion. Of course you could just check with Jean's escape and temperature to see what might be liquid in the middle/outer zone.
Except for the size part, this is how I go about generating a UWP ( although it is still geared for habitable zone worlds ) from a few years ago.https://sites.google.com/site/moukotige ... /uwp-1/uwp
Here is an inkling of how I handle population...https://sites.google.com/site/moukotige ... population
Everything else, I handle in a completely different fashion and I've not written it down in a form I can put online yet.
Tech, gov, law, starport, ect. is modified by pop, and Hofstede's Cultural Dimensions.
From these, I guesstimate the economy based on Pocket Empires.
I'll be glad to post my crude spreadsheet if it might be helpful or give ideas. ( its only rough system info and habitable zone for now.... not even moons yet )