[Den-O]

You know it's funny. The AEUG and then Federation spent years developing a transformable mobile suit project that was cost effective, starting with the original Delta Gundam Eventually it resulted in the Zeta & ZZ and all of the variants in between. But making a truly cost effective mass production suit based on the Zeta series never quite panned out since everything was either one-off or limited production runs The FAZZ, Zeta C1, Re-GZ, ZII, ReZel, Delta Kai, Z Rapier, etc.

It's funny because the perfect mass production suit that combined the best elements of the Zeta and ZZ projects was in fact made by Neo Zeon. The Bawoo. Seeing as it was built based on stolen designs of the Zeta Machines, incorporates the top and bottom fighter concept introduced by the ZZ, and it's upper half is almost a dead ringer for the Zeta, it wins. It's the most cost effective and versatile of all the attempted Zeta MP's.