i found that there is another Classics/Henkei scale UM coming out.
its discussed on the KOToys Forum and also ACToys Forum


Its supposedly made by CHMS (the guys that produce high end KO's of the henkei seekers)

there is also an interesting video of the transformation here:
http://v.youku.com/v_show/id_XMTk5NzQzNjQ4.html
(password: 1986)

Arcee, this looks like its still in development, but if you dont mind buying 3rd party toys, then it could be an option for you.

that or you fork out 1300USD or so and buy the marksproject (anemis) Masterpiece UM trailer upgrade - perfect edition. lol.
http://www.marksprojects.com/perfectultra.htm
http://www.youtube.com/watch?v=39bgQMEzmO4

otherwise, you are pretty much in the same boat as everyone else here who want a more accurate UM figure.