Hi, I'm WhiteDragon25! While I don't have the technical expertise to actually create a mod, I do have a wealth of ideas and concepts for one. You can see my mod ideas here on my profile blog, where I talk about them in detail.
Reign of Steel's Chameleon Stealth Tank I find to be a lovely design, so much more powerful-looking than, say, TW's Stealth Tank. Pity that the Chameleon can only run around in RA2:YR in pixel form, rather than C&C3 in full three-dimensional render glory! :P
If this were actually available as a viable C&C3-usable render, it would be my first choice for a Marked of Kane unit. (Once again, mentioning that mod idea of mine... eh, I'll explain it in a blog post... eventually... damn, I got to stop procrastinating...)