I've been seeing these on youtube and think its a pretty sweet idea.What does it take to build one? I noticed the nytro seems to cradle its engine,does this cradle have to be widened or chopped in any way,or do you just cut off and weld on new mounts to the existing frame?Do the plastics fit?Any info would be awesome,thanx.And lastly where do you find a gutted nytro?are their any good sights for rebuildable, salvaged, late-model snowmobiles?