Is that some kind of vintage conversion? Never seen one before, very interesting part!
I'll echo what super dan said and say it would be a shame to start machining the moulding. I'd run it as it is, and if you have a machine shop then you shouldn't find it too hard to run up an alternative chassis to your own design.
Weight distribution is really something you need to do testing with. Having the stick across the width of the car could make the car a bit less responsive, BUT sometimes that makes it easier to drive too.
Looking at the design of the conversion, if you were to make your own chassis you could probably move the cells back closer to the motor, maybe run them as a narrow 3+3 or a 4+2, maybe run a longer wheelbase on the truck for extra stability and to get more weight over the rear wheels again. Lots of options. Lots of fun to be had.
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