I've got an idea for a scenario for you. I really like the idea of having to craft certain things for points, but I don't like just leaving it at that. Eventually, people will find the best items or whatever to raise the meter and I don't think that falls within the spirit of Factorio. So, here's my proposal.
Each team is started with 2 identical, basic setups. Something like 10-20 steel furnaces with enough materials to keep them constantly moving, and a basic boiler setup with a decent supply of power just so they don't have to waste time on what I like to call the "chop tree" phase of the game.
They're then given some time, maybe 30ish minutes? Maybe that's too long, but some time to prepare for the rest of the match. Halfway thru this setup phase, the scenario picks an item that will be worth points and announce it. Something like "Phase 1: Green Circuits". The goal is for the teams to craft and place as many of that item into a "Victory" chest (which would consume the item and increase the teams' points). This would just be a chest somewhere close by that the teams have to insert their items into for it to count, and cannot be removed or destroyed so they have to work around that. This would run for a period of time, halfway into it would announce the next item that will receive points. Each phase a new item is picked, and you do it for 3/5/7 rounds, whatever works best (or make it configurable?). Here's the kicker: once you transition to a new phase, you can still insert the previous item to the chest from past phases, but the new phase gives more points than the previous phase, making the previous items less valuable. This would add some flexibility and risk to either improve a working solution, or scrap it and go for big points in the next phases.
Alternatively, you could say all the phases up front, and what items will count when. This would allow for a more focused approach, perhaps allowing teams to neglect early phases, and concentrate on hitting it big at the end, or staying steady the whole way.
Let me know your thoughts, and yes, I would playtest the sh*t out of this with my crew. Thanks for the inspiration