It can be done
I took a risk to see what plastic parts from the 300/250 rr model fits the xtrainer .
ordered me up a set of polisport plastics and they are nice and they seem to be less brittle than the ones from beta.
every thing bolted right up but the rad shrouds have to be flexed into place but just slighly. 2 of the mount holes could not be used.
The mount hole on the point nearest the radiator I figure could just be cut off. shroud seems well mounted still. enjoy.