Dislclaimer: I am still learning how this all works so I can pinpoint a more accurate calculation before jumping in. 

The first thing I would be aware of is if the numbers the seller is giving you are truly accurate. 

All their other comments are accurate so it comes down to your choice.

I always recommend standing out from the crowd by providing your investor buyers massive value and good, accurate data.  

I know that water is available at the road if I wanted / needed to connect, no sewer available, not sure about gas.I created a cap expenditure spreadsheet to try and accurately evaluate the costs, but Im not sure about it.

Unfortunately, not all the advice you will see posted on this forum is based on the most current and accurate information. 

Any other online resources recommend that are most accurate? 

All the comments provided are accurate in normal situations. 

paying recapture is the most NON talked about event on BP or in real estate.. and why when folks talk about buying for only cash flow and appreciation IE speculation or gambling those folks totally miss the point and do not have a full picture of the Lifecyle of a real estate investment.. if you have NO appreciation your recapture tax is going to eat into your IRR in a negative manner.and for a lot of folks to 1031 one little house with 20k coming out of it is hard to do.. since the house never went up.. the other thing is people that say they are buy and hold forever.. this rarely happens.. life happens life changes.. and so 7 to 10 years down the track MOST folks unless they have decided to make it their lifes work IE be a full time professional landlord.. they sell .and then that pesky recapture they never knew about or thought about bites them .. :) 

So I’d restore as much as I can and when needing to replace something, look for period accurate items to match the rest of the house.