T2k13 Engineering Tasks

[NanbanJim]

So I'm eventually starting up an online T2k13 game for a group of online friends. They enjoy adventure, but not solely combat. A core focus is going to be on rebuilding (which should lead to the conspiracy subplot).

What's driving me batty are engineering tasks. It's intimidating, and I don't mean the math! Figuring out what I have to figure out is a bit rough.

Does anybody have quick cheat-sheets or processes for engineering tasks? How about best-practices? Pitfalls?

Also, a lot of the verbiage on building materials is "as appropriate to the materials of which the structure is made." So how do I determine whether a structure or area should contain Light, Heavy or Industrial materials for salvage or require them for building? I don't need perfect detail, but a ballpark figure that "feels" right. eg if a city block contains X tons of material on average, I can SWAG the ratio of Industrial to Heavy to Light. Same problem with what structures require Heavy vs Industrial materials.

I really prefer simple SWAGs that should feel right to most people. ... but I fix the internets in my day job, I've got no idea what should "feel right" for construction, haha!