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Try a couple reactant dynamos paired with survivalist generators. Won't be able to run everything full time but as long as you have batteries set up to collect power when your not using it, you should be good.
I was lucky and found two redstone energy cells. I run the reactor just long enough to fill them up...saving up the yellowium until I set up some controller to auto start/stop the reactor when needed.
Could try for reactor. About day 70 for me and I have a 5x5x3 (with redstone as coolant) that makes about 350rf. Nothing special but works for now until I need to increase it.
The smelterys are random in the cities so not able to pinpoint a location. Best bet is to circle around the city edge and try to find one that's close enough for you to get to.
There is a way to get a smeltery without going to the city. Melt stone pebbles in a crucible and pour to make a seared brick. Will take forever (i think 100 pebbles per brick) but it is possible.