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 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 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.  

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

True private money is a lot of times more expensive then alternative lending.

They are still a marketplace, but are working hard on transparency, data aggregation and reporting for buyers and trying to offer a nice alternative for investors who want to go the passive route.  

This is because you need to show material participation.

Most of these guys out there want to do "cost plus" contracts so that you're responsible for all the labor and material costs and they just tack on their 18 to 20% on top. 

They may be able to suggest an alternative (ie you pay some of their guys to do it after hours).

Do you plan on project managing/picking up materials/etc or hiring a GC/PM to do it all?