Cool love the inverted inline 4, like a PT-16 trainer http://www.wpafb.af.mil/museum/annex/an46.htm (low wing, braced mono-wing, open cockpit tandem). The listed LOM weight seems a little on the heavy side by a goodly amount. Also HP claimed is some times a little shy of actual. G
I think a RV4 would look great with an LOM engine and a throwover open cockpit ( 2 windshields on the canopy frame). The wind on my scalp, a long sleek airframe. It?s all good stuff.