Mike - Hawksworths were 64' x 8'11" (9'3" over handles), so I see no reason why they not eligible for the North Cornwall, but I guess my point was, as indicated by others, I've never seen any pics of (G)WR vehicles on the 'withered arm' bit of the line, i.e. with the exception of the odd interloper from Bodmin on the Wadebridge-Padstow section, so I look forward to Adam's picture references. (Edit: have just seen Adam's latest - thankyou!) Nice to hear that foreign BGs were seen at Padstow though, but I guess they must have been uncommon. BGs of any provenance were very rare on branch lines.
On the curtains matter, 3rd class compartments on Hawksworths were fitted with them, but I feel Hornby has greatly exaggerated their prominence, both in the 3rd and 1st class compartments. The official drawings do show a Hornby-ish shape, but the drawings were done to show how the curtains worked, and are not representative of how most were 'drawn'/'hung' in normal everyday working.