@Kyle Klineall great questions and this is the challenge right now with both prices and rates high. 

What do you do to revenue predictions to account for the fact that some owners don't set prices high enough to the market rate, or set them to high and don't get booked as much?

but if they cannt afford 20% down ($60K), they are a high risk of not making payments; and there are legal costs to foreclose and get your property back

You can't give up even after days/months of not producing results, which is highly unlikely. 

What is the rate/structure of the loans on them - is this Hard Money - high rates?

It seems quite high to me, especially considering I'm still relatively new to this field.

Most plumbers don't know a lot about sewage ejector pumps because there is not a high percent of them around compared to the millions of properties.

If the loan amount exceeds $1M, then rates are in the high 6's to mid 7's. 

Above ground, unless a huge amount of great landscaping (and high maintenance) would be need to make it pleasing.

There are some construction loans that will fund up to 90% of the build costs with qualifying income but again my debt is just so high because of these other mortgage payments on my credit.Somebody help give me the answer I'm looking for so I can create this unique stay!