Yeh, I'd like to help out, but I'd need to know more about your setup. I can get
fans at cost from a certain wholesaler, but to be honest, they're still mighty expensive [Fantech, but Dayton & some others are up there too; Fantech is made in Germany, and is a quality fan, so I didn't mind paying a little more].
Soil, I don't know what you have in mind; I'm using Fox Farm Ocean Blend, and it ain't cheap either. I know $1600 sounds like a lot & sure ain't trying to put a damper on your plans, but in building my grow room, it seemed that costs just kept mounting at every turn. L, I probably spent $600 on nutes & other speciality items [pH adjuster, etc....].
Good luck, but please state more about your room, like what's the cubic feet, etc...