Hi,
I didnt reduce the bonnet or cab height but it is a big lump! The bonnet couldnt really be cut down due the the motor etc, although i did shorten it a bit. The cab though could be both reduced in height and width, Which I think would help a lot. I might do that if I do another one. It looks fine with a rake of wagons, but a bit big when next to a 31!
Hope this helps
Best wishes
Nige