Okay, so the hangin' bug bit me and I ordered a GTUL and then a Hennessy. I worked over the Hennessy with 1/8" whoopie slings, some long tree straps from Arrowhead and a couple Camp Nano biners for the strap end.
That left the original Hennessy tree straps and some line. I transferred those over to the GTUL. Then I decided I liked the easy setup with the whoopie slings, so I made a pair for the GT and I put a pair of Wild Country Nitro carabiners in the channel, like the GT Nano. That makes for a nice day hike rig that is just a pound complete. I can still use the stock Hennessy tarp for a lightweight overnighter. The hardware can all be re-used on a new rig if that comes up.
Tree straps: free, or $8 if you count the straps I bought to replace them
20' 1/8" Amsteel $10