The CD009 is more like 130+ lbs without the shifter assembly. The 5 speed ZF is 82lbs with the shifter. Just about a 50lbs weight savings. It's not insignificant and the ZF doesn't have synchros issues to boot.
I've weighed both with a very accurate load cell, but only have a pic of the CD009 being weighed
CD009
Keep in mind that those ZF transmissions were generally paired with taller final drive ratios compared to Nissan's so don't forget to take that into account.
As for everything else, measure twice, cut once so to speak.