Hey guys, when I built mine with the DLE-20 I used the conversion kit sold by Aeroworks for about $25. With that comes a smaller fuel tank to be mounted on CG under wing, thin covered plywood tank backing plates and a template for proper drilling locations and for cutting out engine mounting area. A descent builder can figure this all out but it was worth the $25 bucks in time that it saved me. More details can be found on the Aeroworks website. You also want to favor a little nose heavy for sport flying unless you do extreme 3D. Hope this helps.
Frank