Didn't Newton Abbot have a motorail terminal at some point?
Yes!Newton Abbot used to have 4 through Platforms, the up Platform 4 and the up through line came out of use with the opening of Exeter power box.
I believe there were Bay platforms 5,6,7,8,9 and 10.
The Platform still with Track nearest the Railway Brewhouse I believe was Platform 11 (might have been platform 9) this platform was used by local trains to Moretonhamstead and the Teign Valley line to Exeter.
Not quite correct. There were, as you say, four through platforms, but each was split into 2 - numbered 1 thru 8. The Moretonhampstead/Teign Valley bay was Platform 9. This bay was also used for the motorail services.