Pete it All depends on the chipboard if it has a green coating it is Water resistant .i paint them with crersot And let it dry them every Time i clean the box a light spray with Vircon S .
Only thing with your sugestion would be a jump of approx 70 miles i think A race inbetween Otterburn And a 150 miles would be Better And 6races is Enough OMO.
Way things Are in todays racing is a hit or a miss IMO All you can do is race what you have And see how they perform ,select the One's that do ok And breed of them ,And give up on the The also ran ,let the basket tell you what to keep.