I have been waiting for this to arrive as I already had the very fine Kato 103 4- wheel mechanism to hand.
The small locomotive came in a white tough, flexible, plastioc and easily slipped onto tthe mechanism - instant loco!
There was a slight bowing of the side frames below the foot
plate but this was caused by the protruibance opf the mech's axle boxes.
Relatively easy to fix.
Now to detail the loco a little and paint, BUT how do you get over the "orange peel" finish first?