Yes it was also discussed back in the olden days when we had someone at GM on the site to answer questions and read owner's suggestions. The GM rep back in the first gen days stated that it would create too many leak and locking issues to have the midgate split.
Wow, from the Horse’s mouth as it were.
Since 2003 I have been contemplating making a left and right, lockable, wind proof and water tight, end-caps out of a heavy duty polymer that is moulded to slip over (and fasten) both sides of a mid gate if 1-2 inches were “sawsall’ed out of the vertical space in the mid-gate between the 60-40 split.
I never wanted to spend the price of designing, engineering, layout and fabricating prototypes not to mar toon the manufacturing costs attached to the old fashion way but now with 3D printing... my son-in-law has a large 3D printer at his physics lab on campus and can fab them for a decent price I think. Any Ideas?