[roboticWanderor]

Hey there!
Not sure what is gonna go on top of the robot and whether it will provide any extra support, but there does not seem to be much keeping the two halves of the drive train parallel. putting a triangular support on the upper back corners, or bridging the gap about halfway up the chassis would do a lot to keep the two halves stuck together.
If you did that, you could reduce the beefy super structure you have and save more weight than cheese-holes ever could.
Someone else already mentioned my other concerns, good luck!

PS: nice to see you back Craig!