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If it is a standard garage door size you could use a 140 x 100mm deep concrete lintel to support the timber frame and bed it into the piers by 150mm either side. Check Building Control will accept this though but that is often a method use rather than digging a foundation.

Yes that is right mate. I am not claiming to be any type of expert on this subject but I always understood if the roof was not triangulated, typically the roof was supported at the ridge as it would not be able to spread if it was unable to move downwards. I know it is a complex subject but by...

As has been already stated if it picking up the floor loadings you should go down to good load-bearing strata. That could well be the 900mm you have gone down too for the main trenches. Sadly it is not for Building Control to advise, but to check you have done it correctly.

Having seen other designs I have seen a vaulted roof created by applying a steel or timber structural beam at ridge level to stop the roof dropping. Instead of choosing this method would the addition of two purlins, at midpoint, splitting the span of the rafters work in the same way?