My assumption is that all tenants have an interest in keeping their cards close.

A heloc is an open end mortgage or in simple terms its a high risk credit line similar to a credit card that sits in 2nd lien position adding another trade line to your credit and reducing DTI.Just like a credit card if you ever miss a payment on any debts on credit or if your scores drop unexpectedly they bank can close or reduce your line of credit.

The guy messaging me says he will be the primary person of contact and be paying with a credit card for payments.

I've tried using greeting cards of various colors, using off season stamps, hand writing the letters, using colored paper, and even putting photos of projects I've done. 

Pretty unreal.At some point, this house of cards will collapse.

You might spend $3000/month or more mailing post cards, and making a ton of phone calls, or just driving for $.Buying from many wholesalers is risky. 

Same thing for cameras: I like old style trail cameras with a memory card (for rural properties personally) but if you have wifi onsite, or if you're willing to sign up for monthly fee (services for $5/month and up) the ones with a sim card are getting really affordable nowadays too. 

Credit cards are an "investment"? 

Drafted a plan, gathered estimates, created a budget, put together DTI sheets, even got an "as-built" appraisal, and also have it in a permit status at the Local Building and safety office.Then I started to look into the construction loan and the permanent financing....to do it myself, and not through a builder.I soon realized that there are sooo many companies out there that want to try to help...but cant  (some of them were even on this network of people):  don't have builds on record, won't allow for owner-built homes, my credit is less than 680, while carrying the construction loan, there may be a point at the end where because i have my rental house while building that it become hard to pay, and  I can't pull out a private loan to help start process because my credit cards balances are horrible...and my "business" has no show of income.So, now we are here in the present time....   

Can anyone answer the typical payment lag for ACH or credit card processing?