Here is a build one of my members did for me. I've ran it several times at the AAF museum's battlefield. It seems to be holding up pretty good. The gears are the metal replacement ones. The suspension arms are Daryl Turner's machined aluminum ones that he makes and sells. And yes, you really need to beef up the chassis as it has lots of flex to it. I have also had Daryl install an aluminum drive sprocket and steel shaft with ball bearings on the idler as I have snapped two of them off by just running into something. Both of which he makes and sells as well.