Community building rules?

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Hiya,
Long time gamer here who never got to GMing TMP in the 80's and is now finally able to give it a shot.

Have any of you implemented any kinds of rulesets for community building? Mutant Year Zerr, Other Dust and Broken Earth etc. have some sort of rules for that but not sure how they would really work.

Since such a huge part of TMP is rebuilding civilization I was thinking of some sort of "technology tree" and resoure management system that would make it concrete yet gamey enough to be interesting for players.

I mean my players are not really interested in knowing exactly how much of what kind of fertilizer is needed/acre for some specific crop but they would be interested in getting the community to "Farming level 1, produces X amount of food", now we can start building greenhouses! and so forth.

How have you handled the community rebuilding efforts gamewise in TMP?

Also a bit related...since the characters soon find out that they are about 150 years late how do you encourage them not to simply abandon the mission and go murder hobo with all the gears and ammo they have?