Hey OZ, that's RA Cores in the 1992 article. They are the original Gremlin folks and still the source for kits. At $35 for the kit, I don't know how one justifies the time to source and scratch build one though we have done it here. I did just what that article warned against. My original one is sheeted and glassed and still flies great with a .25 and has lasted about 10 years and two mid-airs so far.