I think the footfall system should also help to get fuel for larger builds ... if you have a large cool building people will come visit it ... then you get money .... for that you can get fuel. May be we get a direct funktion to directly injecting the footfall to the beacon's fuel tank. That would help to finance such big beacons as well.
For managing fuels and beacons we could get a high end tech terminal which is connected to your beacons .. when you have it, all gets easy, and if you cannot make it find someone who has the skill
I also think that the costs for beacons should scale with size, but not much ... like mentioned above. Something like: ..
1 plot - 1 unit/day
10 plots - 3 units/day
100 plots - 10 units/day
... and high fuel gets you 10+ units per block, so that Endgame gives you enough opportunity to get the stuff in big enough charges ... or at least trade for them