Originally posted by FUK_WRX
To be honest i dont know, a mate told me who i purchased this froma said it was from tamiya, he said was a prototype that did not go through producation. Although there is a 1X6 layout chassis for the 414 made by Kai models, only they are dead hear to find. 
By the way, The guy who owns BMI RACING (they have a discussion thread on this borad), he said that he would work with anyone to make new chassis. So if you ever think about reproduce that chassis, you should talk to protc3 on BMI Racing thread.
I would buy one too, if it's availabe. It's really cool to make a 414M into a 414.5m.
A very nice personal touch.