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if that makes sense?
Yep. I was assuming you would need to build a timber frame within the opening as I couldn't see that in the last photo you posted (garages you're trying to buy). If that's not the case then you're all good opening-size-wise and can ignore me :)
Hadn't clocked those hinges either. They solve the "door in the way" issue.
If you ever forsee a situation where you're going from one garage to the other you'd have to go a bit further (minor inconvenience), but also would be quite isolated from one garage when you were in the other and might not see someone coming to swipe your bikes/tools/whatever (non-minor inconvenience), when with an up and over door you have a bit more visibility. This might be a non-issue based on location though, if it's not a through route?
EDIT: I'm a few pages too late. Just thinking of practicalities of actually having the doors, not how you'd build them. I'm not the person to advise on that!
The centre line of rotation through the hinge pin is on the centre line of the vertical members of the frame, the doors therefore open in a way that doesn't narrow the aperture afforded by the bare frame, if that makes sense?
And I can get the car into the garage I rent (still has the original frame) more easily than I can the car with a new, wider frame (the ones I'm hoping to buy) because the distance between the old frame is (guess!) 30cm wider than the new frame side members.