That could be fun, and really any excuse to see a build of the old (1:100 scale especially) Zeta is worth it... But is there really that much in the MG Zeta ver. Ka that's distinctive enough to set it apart from an unmodified build of the old kit? It has a few details added, but mostly it's even more of an old-style Zeta than the ver. 2.0 was.
Nice work. I've been thinking of doing a Gundam Unicorn in this kind of style, but there are always a lot of projects I want to do, and not enough time to do them all, it seems. It's fun to see this concept realized as a finished model. This reminds me of an old resin kit I found online: a B-Club conversion for the old 1/144 GM kit, to convert it into the GM Command. The end result is about what you'd expect, it's still the old kit of the GM but with a few details changed. But it fascinates me. Why was it released? Was there a period where builders were excited for the Gundam 0080 designs, but the kits weren't available yet? It seems very strange to me.