Minimal work would be required (I am estimating $35k based on my familiarity with the building and some padding for some damage).  

The cost savings alone suggest a better mouse trap has been built in being less costly and stressful. 

Go to Office Depot or Staples and get a pad of those green spreadsheets with about 10 columns, if they still make them.Then, for every business decision you make you need to do the math for different scenarios.You do the math to calculate your credit card interest every year.

Containers, fences, roads, pads, security system, electrical, etc.  

The more flexible you are on having a posh pad, the more likely you can make a savvy investment. 

Also I'm financing all my cost to the pad.

It's a bit messy but in the upper right, you can see my mouse over showing detail on the top line of the chart. 

My apt has a mouse problem.

I use a green scouring pad.

I need $500k to expand & open the RV Park on our amazing 45 acre property. 12 to 18 month construction loan would be plenty of time to build the pad sites, add the additional electric/water, rent the spots and secure financing (or equity partner) to take out the 2nd loan.