@captain0
Apologies I have not replied earlier.
Yes it is possible to have new build Bunkers/Forts having Upkeep, yes you would need a different kind of starting Bunker/Fort.
For reference 2HP units like Battleship, Carriers, Tank-Hvy cost 2pu Upkeep. Bunker is the exception and only costs 1pu Upkeep, so long term are good value, but too many and they drain your resources.
Partisans were never in the design of the map, although historically accurate they did sap the strength of the Germans, I thought it was more of a distraction for the player and like in history would be suppressed with reinforcements from the west. I think the German player has a tough time especially if using Winter.
Having said the above if more players want Russian Partisans then say.
It was a design decision not to have resources other than PU as the AI does not understand them, see here.
https://forums.triplea-game.org/topic/3743/how-to-make-a-map-ai-friendly
In game there is enough of a draw to get the oil producing TT and they are also VCs so I think the map simulates it well. On the flip side when testing we did not have to balance the Oil Resource vs use in game. 
However we did spend ages playing against the AI, making it better to give the solo player a cracking game π€―