Before I try to sell the idea to them I'd like to have the best data I can on potential earnings, upkeep costs, likely occupancy, and other points like that.

All strategies can be lucrative and all can be costly. 

A slightly higher upfront cost in a better area will likely yield better tenants and less hassle over time.Investing in McKinney is a great decision, but working with someone local who understands the nuances of the DFW market can help you identify the best opportunities.

Generally there are multiple units for each "zone" if you will when I've seen them installed.Regarding your problem at hand, I personally would simply adjust your plan to move and make your initial plan to get the current issues resolved, while costly now, in the long run holding onto the unit will likely pay off. 

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Hard Money will usually finance 90% of your purchase price and 100% of your repair cost up to 70 or 75% ARV (after repair value).

They are far more common now and harder to find models without but:1) these add cost to the purchase price2) they don't bring a lot of value3) they can leak or detach and damage the propertyI own around 50 doors and I cap off the line at the wall or in the basement with a valve and a cap so the potential for leaks is 0.00001% :-) 

If I had the business headquartered at some commercial or industrial space, I could deduct the entire cost of the space. 

Tailor these amounts to the significance of the task; for example:Roofer: $1,000/day (critical to weatherproof the site).Painter or garage door installer: $100–$200/day.Contract Value & Payment Terms:Agreed payment amount (lump sum or itemized costs).Breakdown of payment terms:Deposits.Progress draws.Retainage (if applicable).Scope of Work:Be as detailed as possible.

This is the cost of doing business.