Well done! On hammocks with many adjustable strings, you can use tautline hitches while experimenting. Don't replace your prussics on this hammock, but when you build your next one, tautline hitches are quicker. I eventually switched to dacron kite line, 150 lb. test at least, with small whoopie slings for adjustment. Some dacron lines are too slippery for tautlines. (For prussics, usually the prussic loop is a smaller diameter cord than the one being adjusted. Amsteel is a bit big for prussics on 550, but if they work....)
Your structural ridgeline will function as a tarp ridgeline, too. I turned my 9" x 11' tarp sideways - it's just barely long enough. For low cost prototypes, a tarp made with 4 mil poly and Gorilla Tape would keep you dry in the woods.
I applaud your investigative spirit - using materials on hand whenever possible can preserve sanity and lessen risks to relationships with significant others.