Woah! Talk about LATE!
Back in late July 2001 when the Yamato VF-1 detachable leg was announced, we challenged fans to come up with an alternative.
I've had these designs in my updates folder for 3 months now-I'm terribly sorry for the delay!

See the requirments and the official 'transformation' here

01
02
03
04
Ka-On Lee
Luis Castillo
George Davis
Victor Lenhoff

 

05
06
07
08
09
Nam Go
Shawn 01
Shawn 02
John Moscato
Mike Matlock

Please vote for your favorite in the MW Forums!
The winner gets a loose used 1/55 Joons Max type valkyrie and bragging rights until the next contest :)