[MetalMan]

The stock chassis is about 5 3/4" (5" of flat space) wide at the widest pint (at the back), but then it tapers to 4 1/4" (3 1/2" flat) at the bellcrank. What I mean by flat space is that 1/4" on each edge is taken up by the bent edges (to increase strength). Then, the mud guards make the outer edges of the chassis parallel with the center line (and the body). So basically, there is no secure space for battery mounting on the stock chassis, which is the main reason why I made a new one :).
This chassis gives the same exact wheelbase as stock. I kind of wish I had remember to make the wheelbase about 1/2" longer, but it is fine.