But with rule of thumbs like the 50% rule, it looks pretty good.I'm using a combination of the BP calculator and the 4 square method to analyze this, but I'm wondering if there are more experienced investors out there who could help me out and see how I can improve and what I might be missing in my calculations. 

There are “fire chasers” in the construction trade, people who offer you a value for your house - for example, while your house is up in flames, they are real estate investors or wholesalers in a sense. if someone is making money out of it, pretty sure anyone can.

I have some pretty big goals, as we all do starting out.

So, my girlfriend is apparently pretty interested in learning about REI. 

They are probably pretty formulaic.

We are in a dual agency representation with the real estate agent and she was pretty forthright about how she valued the property - it is basically based on one lot comp in the same town from april, she multiplied that x2 (the lot is a bit over twice the size of the other lot that sold recently) - there have been no sales of land since then and the closest one before that was a full year ago.

If you file it with your return you can get a refund check from the IRS, sometimes a pretty big one.

You can pretty much always do Sub2, but the real question is how likely the loan is going to be called for violation of the due-on-sale clause (DoSC).

I work for a top 3 insurance company but rates are pretty high, so I'm hoping to find someone else.

But you need a pretty darn good deal to support 100% debt.