http://www.bmikarts.com/Spiderbox-Series_c_165.html is the only other place i know of that carrys just about all the parts for the spiderbox. i know i have one myself thay use the gy6 150cc Howhit Engine.
Will be posting new pictures soon. Totally modified with a Duronax 16HP engine, bigger front tires, back is totally customized. Older brother is now welding a metal plate for the engine.
Lol yeah my brother isnt to organized. Almost finished though. Have to figure out where to put the throttle canle soon. Might do the first start of the engine today