Just maybe add a truss but outside of that and the 35 spline outers and some custom inner shafts and good joints I can't see any need for it being stronger.
See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
<font color=blue>Wayne<font color=blue>
<font color=blue>Happy Trails<font color=blue>