Even then I've had to fire PMs and move to another one.

If you rent the basement room to someone or market the house as a whole counting the basement as a bedroom and a fire breaks out and someone dies or is injured in the basement without an appropriate egress from the room you could be liable for all of that.   

It seems like a great opportunity—it’s located in a charming, small community surrounded by the national forest, just minutes from a major ski resort.

Area, tenant use, tenant credit (i.e. only Moody's BBB or better guarantor credit).There are a lot that can vary in NNN, just like any other real estate.You have market risks: FL has another hurricane coming, CA has earthquakes and wild fires, the midwest has anemic population growth.You have some location risk: is building on hard corner with signalized access or buried mid-block with no turn lane?  

Right or wrong I am of the mentality: Ready, Fire, Aim.

Common utilities paid by the landlord will be similar if not the same; standard services (extermination, changing filters, snow removal, fire safety inspections etc.) will cost the same.Expenses will vary depending on the market.

I'd fire the PM immediately. 

We do have plans to add a 'park style' grill, picnic table, maybe a few fire rings to make for more sites, but still aiming to keep it simple and cheap.

The market is on fire because of great macroeconomics - population growth, job growth, and companies moving and developing here like Intel, Google, Facebook, Amazon, Honda, etc.

They are asking to see the space so they don't wind up jumping from the frying pan to the fire.