@Harry Metzinger, I've done several "creative cash" purchases in the past without incident. I have to disagree with some of the previous posts that your offer is not a "cash" offer. In my experience, sellers have two broad categories that they label "Cash" or "Financed".
The Financed category is for someone that's going to put the house under contract and then apply for a loan to buy the house. The seller doesn't prefer this option because there's a decent chance the buyer can't get qualified to buy the house and therefore the deal falls through and the seller has to start over.
The Cash category is basically for every other way you could purchase the house that doesn't require you to get qualified for a loan. Hard money lenders operate similarly to banks so those are obviously Financed deals. Your scenario though fits into the Cash category because you're using "cash" (liquid assets, LOC, etc) that are already yours. You don't have to get anyone's permission to use those funds to buy the house. The idea that you have to have $20's & $100's in your possession to make a cash purchase is simply not true.
I use my business line of credit to make "cash" purchases all the time. Even though my bank does an appraisal, title search, etc before I buy every house, they are always classified as "cash" purchases. To get the seller on the same page, I always include a statement on my offer that says I am using my business line of credit to make the cash purchase and all associated fees on the HUD will be paid by me. I've never had a seller (private, bank, HUD, VA, etc) that would not accept this method. As long as they see that you have a path to get the money and you check the box that says you waive the financing contingency, they consider it a cash offer.
Regarding your original question about what kind of checklist to use, you should talk to an experienced (local) real estate agent. Hire them if you need to!! The cost of their commission can be minuscule compared to the trouble you get yourself into by flying solo. Good luck!