So a 1031 from buildings into raw land is perfectly fine as long as it is being held for investment. 

There is not a lot of good info to be found on raw land financing.

Purchase price: $1,900,000 Cash invested: $1,700,000 Put in Smoke Detectors (there were none...seriously), CO detector, cured raw sewage in the basement, etc.

I assume that the best structure would be a mixture of cash and loans, but would love advice.I need to find/purchase raw land (currently looking around 10-50 miles outside Austin City Limits), build out the infrastructure with my construction company, and ideally purchase/own all of the trailers I rent out at a monthly rate.Questions:1) How much of my own money should I use (20%, 50%, as much or little as possible)?

Literally there is nothing for 2 or 3 miles on Las Vegas Blvd, the world famous Strip, from South Point to the M Casino (the price of the raw land is too high to build anything other than high income generating properties like casinos but nobody is building casinos).  

Then raw numbers are given which are either disregarded or refuted. 

After many years into the real estate game, cash or credit may not seem the obstacle they once were, so I have to "reach back in the files" to pull out an old memory (to quote Alan Jackson "Drive")......I recall being very thrifty and a saver in my 20's (I had an insane dollar a day budget thing I did in the early 90's on canned beans, loaf a bread and raw carrots, which I would not recommend, unless you live in a mobile home on a construction site like I did at the time)...

Sit down with them awhile and do some detective work, too, like actually call insurers, trash and utilities, mortgage brokers, tax authority, etc...Your calculations will only be as good as the raw numbers (and I find sellers may give rosy estimations sometimes, rounding income up and expenses down)...

My wife and I have flipped a couple of raw land deals.

A few years back I made this sweet template which uses raw data and generates a full report through searching, matching, and adding various columns.