experienced RE investor with new issue I have never encountered. 

I’ve also been in touch with a company called Maintence supply headquarters, that provided me a very reasonable turnkey materials quote for each unit that included everything from door hinges to full appliance package.

., with min loan amt of 50K at 12% for a renovation (Fix/Flip) package...then following the BRRR (not sure how long their seasoning period is...but I'll ask) we can do a refi at their 6.1 conventional rate.Conventional loan: McGloan, 30 yr fixed rate, 4.8% (not bad)Im concerned with interest rates going up that perhaps we should lock in that low 4.8% rate (conventional loan), and pay out of pocket for the renovations ourselves?

I have not done any kinds of deals like this one, but with this being a financed purchase, I would think you would have to get a commercial loan where the rate/costs might be higher and the amortization possibly lower as you wouldn't be able to get a traditional residential loan (to my knowledge) on this package. 

I’d be interested to know what hurdles you gents are encountering and glad to offer up some help.

Most people I've encountered doing it have some relevant sales/marketing/construction background, and the wherewithal to have marketing budgets in the thousands of dollars. 

I have been watching every YouTube video I can, reading as many books as I can, and talking to every investor I encounter.

Get disclosure packages, which listing agents will generally send out to anyone who requests them saying they are interested in the property.

. #1 was what I was thinking, but I was not sure if you could “replace” the note with cash without affecting the 1031 process.I am hoping to buy a package of houses via seller financing, but the seller wants to 1031, so I am hoping I can convince them that this is still viable.

Also, it make sense to build a credibility package.