If your newly subdivided lots are 150 feet wide and you have 50' setback requirements, then you can build a 50' wide house. 

I had to connect all of the dots and learned a ton about moving double wides!

If you cast too wide a net, you'll just get pulled all over the place. 

$130-150k seems like a wide range?

Search on BP and you'll find the formulas, you may be finding that books are general because they try to appeal to a wide audience and all real estate varies by locality what is true in one city is not true in another.

I'm not saying to avoid cheaper properties (I have a wide range of price points in my portfolio) just make sure you're not wearing rose colored glasses when you run your numbers. 

Whole sellers have a wide and short range of knowledge.

Clarity of goal and personal investment strategy helps reduce the confusing array of choices which cause us to freeze up.

I can suggest general asset structures, but when it comes down to the details of investing I give different people widely different answers depending on their circumstances.

Purchase price: $1,000 Cash invested: $3,000 1-1/4 acre Land and single wide trailer.