Will,

I think once you have the farm up and running, you should use a part of that 25% to take a stab at developing your own chip. There is a huge amount of incentive for this, and it will be a small chunk out the 25% when you have 300-500TH mining.

The first benefit is it will cut your costs to expand the mine, meaning for the same price you can add even more hashing power.
Secondly, it can provide a huge revenue stream, probably even bigger than mining. You can sell bulk chips, and sell your own miners.

Some off the top of the head numbers.

20,000 units X $3,000 = $60,000,000 in revenue, which 90% of it will be pure profit given the insane mark up of mining hardware.

I think it would be quite foolish to not take a stab at the manufacturing side, given the amount of money you will have from the 25% to expand the business.

Just my two cents.