Y3 Frame - > Y6 Shell

[nw-modeling-list at nwhs.org]

Is the running gear from a LL Y3 comparable to a Y6?

I was thinking of modifying a Riv Y6B shell back to a Y6
and mounting it on a LL Y3 chassis...I know the pony and trailing
trucks would need to be changed to the roller bearing type...I'm 
not sure about the running gear, wheels, valve gear etc...I think
it would make a great Y6!

Thanks
Leslie