We are contemplating refinancing the 6 houses into 30 year loans and taking ~$220K in cash out. 

they did not buy the homes fix them then sell.I had a decent size HML company at the time and started funding BRRRR for rentals in Detroit in 02.. and to your point we would not provide the A and D part of BRRRR until the buyer/borrower was qualified from the take out lender..this point is sorely missed by many doing BRRRR today who think its some new thing just thought up and a book written about it.you exactly right anyone contemplating this method of investing should get their take out loan approved or at least deep pre qual before they purchase.In our model we had our clients fully qualified and appraisals ordered on what they were buying and the refi was sub too a 442 re inspect.. there was no seasoning then.. so I made the HML and my average loan was out 91 days.. it was great for about 6 years.. 

I've been contemplating getting my real estate license.

After hanging up, you contemplate if you should accept.

That makes you (or rather the tax return that reports it) the taxpayer.If you are contemplating taking title to your new property as a single member LLC that will be taxed as a sole proprietor then you might be able to. 

I am seriously contemplating throwing some 1/2 drywall over it even though the handyman already did some removal of all the lose stuff.

If multiple lenders refuse to lend to you then perhaps contemplate the remote idea that perhaps the issue, if there is an issue, is not at the lenders end.Lenders have sweet spots for where they like to lend.

Someone please let me know if what I am contemplating sounds really stupid?

I have been contemplating on purchasing a home in this area but most of the homes are old and needs some TLC.

I am contemplating buying a co-op with my longterm girlfriend with whom I have a child.