What about replacing the roof?

I'm contemplating taking the Directv received out of the unit and replacing it with a Roku/AppleTV/Google Chrome, etc. to offer streaming services, or maybe a DVD player with access to those streaming services. 

I've seen "permits pulled" before for only something simple and unrelated, like drywall replacement in the 2nd unit, with the owners insinuating the permit was for the addition as well.

We had a couple weeks in the winter to have it replaced, and even with my father doing a lot of the work (crushing the old tank, grading, seeding, etc...) it cost... $12,100.Original profit would have been $36,166.10, which still not great, would have landed me better than originally expected.

If those cabinets have good boxes (i.e. plywood) and you want to save costs, you could re-face them (or maybe even repaint).Alternatively, if you replace the cabinets, I would look for ones with good quality boxes that you could reface down the road.  

They existing floors are like new (one owner home) and will be stained a medium to dark brown as well as new hardwood to match existing floors will be installed in the original kitchen to replace the vinyl floors that were original to home.

As I begin to develop a passive income stream, I would like to begin working less at my full-time job, and eventually transition fully into real estate investing, considering I am able to replace my current annual salary this way.

If it was a basic renovation, then $900-$950.Had a quick look at permits and there seems to have been a couple of roof patches in 2006 and 2008 but not full replacement, so you would want to verify that.

Of course, if you are going the self-assembled team route (as opposed to full-service turnkey), there is the possibility that one of the cogs in your machine fails - your contractor bails or under quotes, your PM drops the ball - and you have to take a last minute flight to do damage control and find replacements.

I retired early two years ago and thought I would purchase a mid size MF to replace lost income.