What would speak against nerfing the costs of the reactor components, though?
5.3 copper ingots, 2 tin ingots, 8.5 iron ingots for a god damn basic B fan, really?
Something that has bothered me about reactor vents is that they incorporate an electric motor in its recipe, but they don't require any external source of power to actually vent out heat from the reactor.
Might be more fun and challenging if you had to supply a small amount of power for each vent to remove the heat from the reactor. Forgetting to power the vents would lead to a meltdown.