A hoop gear from wheel to wheel isn't the lightest and requires a blank about 10 feet long that's hard to find and ship. A single short slab like the Cessna/Citabria/Grob/RV just slips into a socket. A single slab of 6"X 3/4" x48" can be sawed lengthwise into both the 4" X 2" gear legs with no scrap. The hoop gear has considerable scrap. The internal socket and truss would require fabrication. And how does a ring hoop gear attach to a flat 701 belly?