Copies of receipts for materials and paid bills for labor are evidence of value, but not essential.

I have read through most of the materials on Mark's Land Geek website but I have not made the jump to pay for the course. 

If you don't have a contractor, shop around for the hardware (appliances, counters, flooring, etc..) to get an idea of the material costs then add in labor of hourly rates for the install.

Hi Shrijan,Welcome to the forum.Personally, I'm not a fan of out of state BRRRR.On paper it all sounds good and great but I've been in the game long enough to have witnessed otherwise.I would always advise doing BRRRR in your own market if possible.There are too many links to a chain with this approach and if one link is faulty, you chain becomes useless.Otherwise, (Yes, I'm bias lol) an alternate solution is buying turnkey.Wishing you much success 

Considering your goal of house hacking a duplex, while FHA loans are common for first-timers, there are alternative financing options to explore:Conventional Loans: Need more credit and down payment, but offer flexibility. 203K Loans: Ideal for fixer-upper duplexes, bundling purchase and renovation costs.VA Loans: Great for vets—no down payment, competitive rates, and no mortgage insurance.Portfolio Loans: Private lenders, good for unconventional income or credit histories.Hard Money Loans: Quick, high-interest, good for investments or major renovations.With $30,000, mix it up—use it for a down payment, maybe pair with a conventional or FHA loan.

I would not be good at either of those, but that's probably where I would start researching if I had your skill set.Folks have been talking about 3d printers.  3d printed materials are inherently weaker than conventional methods.  

I am bringing a single-family property located at 1360 Meadowood Dr, Hixson, TN, to the table and seeking a partnership to provide labor, materials, and an upfront investment of $40,000.

As a viable alternative to explore with a lender, consider the advantages of a 5% down conventional loan, or even less for qualifying first-time homebuyers, which often comes with less stringent property condition requirements. 

I utilized (and maxed out) my credit cards to afford the materials necessary to renovate the apartments (I know bad move) therefore I cannot acquire a loan of any sort to fund the initial funds necessary to acquire a hard money or DSCR or rehab loan.

As a landlord, that may prompt me to not renew the tenants lease hence they would have to seek alternative housing.