I suggest listening to the BP podcasts and get a feel for what area would best fit your goals. 

A:  Yes...and yesThen, you take that cash you get back from the refi, use it on the next property, and repeat all the steps as many times as you can find properties that fit the number profile...which is why the market analysis is so important.

There' all wood and will outlast vinyl - - just look at those Victorians with originals.Retro-fit windows are usually vinyl, easily installed and need no inspection. 

If I get the land, ideally I'd like to be able to buy the MH at a steep discount. 

Not a bad person, the shoe just doesn't fit.

So I could also fit another flip into my budget this year.

There are many people on this site and in the Lexington that fit your description.

Educate her on the options and pro/cons of each and let her decide which best fits her needs/desires.

Ideally I would like work my way up to owning a few multifamily rental units.

If you use PEX (which I suggest because it will not busy when it freezes) then after your valve just sleeve it through the concrete and go to your next available "good" threaded fitting and connect it.