Hmm, certainly looks like there may be no need for a top deck on the belt conversion
Even with an alloy back bone I'd be worried about tweak though, imagine one hard hit that would twist the chassis a bit and the alloy would stay bent
I'm wondering which side it would go on, and which side the motor would be.
The motor could go on the left side of the chassis but the flat bottom of the brace would be close to getting in the way of the motor can unless it stops there but we just can't see that in the pic. It could go on the right side of the chassis but then you've got battery placement issues.
The brace couldn't go on the left unless the servo is moved, and then there's the cells to think about if you have the motor on the right of the mount.
argh... so many ways that will and won't work...
OK, either one of these may be the layout....
brace on the right with motor on the right too, hanging out like a 415 but on the other side. Servo turned 90 degrees to keep it at a sensible width while being on the right too, along with the other electronics. Cells all on the left of the chassis, with the belt running down the middle, in line with the flat bottom of the brace.
or pretty much the same as above but with everything on the opposite side but then the brace would get in the way of the servo
Unless the servo is put almost central at the front of the chassis but then would there be room for the cells behind it.
My brain hurts
I just remembered the motor would be spinning the wrong way if it's on the right hand side, stupid belt drive cars
So it should be motor left, cells on right, or possibly a 4-2 split or maybe 3-3 saddles, I some how favour 4-2 though if there is a split. But the servo location may not be so obvious...
I think my brain just regurgitated over this page
Either way there's still the possibility of a top deck, possibly a one sided brace of some sort, the other side will atleast need spacers.