Planetary Specials should add or subract from an apropriate metter, If anyone remembers the Environmental Preferenve wheel then that would be an excelent way of going about it. A sweetspot ideal add +2, a Good +1, a marginal 0, a bad -1 and a terrible -2. A level of 0 is genearaly needed for a planet to support itself in food with all focuses on food so planets worse then a base of 0 are going to be food importers and are subject to mass starvation if blockaded. The population growth metter is also effected in a similar manor based on the EP preference, Gravity could effect industry too.
As for the Infastructure debate here is how I would propose it be done.
Population x Tecnology modifier = Max Infastructure alowable
Just like in Orignial Moo better Tecnology alows an incresse in capacity but the effect is not instantanious, it requires a resorce/time investment. At first your 10 Factories per 10 population but that can rise a step at a time with each discovery to ever more factories as you invest in upgrading and building new ones.
(Operating Infastructure) x Metter setting = Output
Operating Infsastructure here means the Infastructure that is supported by population and supplies of minerals, only when all are present in sufficient quantities will their be the tools to produce output.
Say for example their are 100 Factores, 30 population which can each work 12 Factores per 10 population for a total of 36. And we have 40 minerals avalible. Only 36 Factories operate and 36 is multipled by the Industrial Metter settins which lets say multiply the output by 25% for a final total of 36 x 1.25 = 45
I have heard that Each focus will stimulate production of its apropriate infastructure on the planet, farms for farming, mines for mining, factories for industry. Change of focus can cause old infastructure to decay and new infastructure to be created slowly over time. I think we should still have some way of excelerating the process though, for example setting "build Factories" as the planets production task.
That's about the way I would do it (although the 'Build Factories' would be the more generic 'Build Infrastructures'), and the
Another idea, the 10 Factories per 10 population could itself be a metter, call it Labor. At 0 you have a 10-10 ratio, tecnologies incresse the ratio giving you the ability to expand and build more and use the new factores. Race picks and leaders could do the same and let you expand above and beyond the normal amount (like the Mecklar in MOO2)
Yes, although I would have the 'Labor' meter specific to each type of Resource (5 of them), with the two parts of the 'Labor' or Max Infrastructure Meter, Technology and Focus (as well as possible Race/Government Bonuses)