OK, so, anyway...
Decided to stop thinking about it, and moved on with creating the tarp for the rear stowage. After researching the different preferred methods for this, I went with a water-based, acrylic silicone caulk mixed 50/50 with H2O. I cut the tissue (nose-blowin') down on a piece of wax paper, coated one side with a paint brush. Flipped it over, and coated the next side.
Laid it down on the stowage, and gently placed the stored items on top of it. Tucked where I could, left some natural drapes and folds. I will work on getting the items planted down more convincingly. When fully dried and cured, this'll be very durable.
Goin' down to the Texas coast for a long awaited, much much needed 9-day vacation. Gonna be a beach bum. When I return, I will write my own manifesto.