I think your rehab numbers may be low, depending on the size of the house and the neighborhood. The roof and HVAC alone might be 1/3 of your $60k number, and kitchen and bathroom rehab could easily use the rest, depending on scope and finishes.
Are you going to be doing a lot of the work yourself? If not, make sure you get bids from all the relevant trades. And get bids for the worst-case scenario; what happens when "slight mold remediation" turns into "the house and everything in it is full of mold"? You'll have to disclose mold when you sell, too - will that affect ARV? Would you pay full price for a house you knew had a previous mold problem?
Don't forget fixed costs related to purchasing, carrying, and selling, which could be $15-18k. You don't want to get to the end and find out the job is costing you money out of your own pocket.
I don't mean to sound like Debbie Downer this morning, but I just looked at a deal this week where the seller estimated rehab at $60k, and the actual rehab is going to be closer to $100k, not including the fixed costs. If I'd pulled the trigger on what seemed like a good deal, without turning over all the stones first, I'd be screwed. Make sure you know what you're getting into.