Hey Iced,
here is what I want to see added. put up some oil tanks to the south of the Furnace, add some sidings, but up more buildings of an industrial nature, and make sure to change the ground cover under the mill to something like dirt or gravel, put in some of those smoke stacks that have fire, make it really look gritty. Some roads would be nice too, think of all factors "How do the people get to work at the steel mill? Ah a road!" Keep on improving and then take a look, lets say a month from now. Also put up more industry, warehouses and stuff, I suggest the graffiti warehouses on the DLS, that puts a more gritty feeling to it! Just keep adding, don't place buildings without a road, place them on a road! Keep your power to, GP-40, GP-15, SW1500, or anything for axle. BTW palm trees are not fitting.
Looking forward to these improvements, think of it as a challenge from a friend.
Cheers.