Tip:

First of all, check if there are easy ways to repurpose the heat, as this is the ONLY contstant result you have. Maybe you can sell of the heat to others (3d printing, space heating, etc.)

Also I suggest to use mining protocol with highest decentralization as possible (stratum V2)

Keep it indeed bitcoin only. Involvement of others has the danger of them becoming greedy and jeopardizing the operation.