Finally got it done.
I bought the awning from Gander Mountain. Wally worked had a cheaper one ($29.00), but were out of stock/discontinued. Gander Mountain wanted $69 and on sale for $49, but on the web for $39. The local store honored the web price so I bought it.
As dumb luck would have it the size was perfect to reach from one O-ring to the other on the penthouse top with carabiners. The carabiners I found in a close-out bin at our local grocery store attached to bottles of hand sanitizer for $.25 each.
DW sewed on a couple of patches with velcro strips that align with the other two center O-rings on the penthouse top.
The carabiners and the velcro strips provide a secure fit to the top and are easy on and off.
And using only two of the provided poles it makes for a simple awning.
That's my easy removable awning. Haven't field tested it yet, nor even tried it in rain. But we want it more for sun/shade. Don't plan on using it during a heavy down pour. I know that with domed roof channeling the rain down into the open doors is an concern of many, but I feel that this should work. If it doesn't, I work on addendum A (what ever that may be).
Our 2351D Phoenix Cruiser, Jack, has turned us from campers into RVers and loving it!