That DuBro system looks interesting too, but looks like it might put the engine way above the rails. If the soft mount is too soft, specially with the 4-strokers, the engine travel will make things worse. I know from experience,made one for my .46 UCD & Saito 100, I had to go back to an aluminum mount, even the FG filled nylon mounts allowed too much engine motion,the plane literally moved around on the ground!!! Really!!! Of course the 100 was way too much engine, but I liked it!!!