RE: .65 "sport speed" - the doodling has begun.
It is purely a myth that V-tail'ed models are any faster than a conventional tail. The first V-tail that I seen in a race was in Northern California in 1981. The rather well know racer of that airplane cheated with engine mods and spiked his fuel with a high nitro/oil mix. He explained his success as the attribute of the V-tail.