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Completing brazing, or welding, after initial tacking/pinning while the frame is still in the jig is not the usual process. So no surprise when a jig is made by a very experienced guy and it has no back side access, it doesn't need it. Most builders will hold the tacked/pinned frame out of the jig during final joining. Access is greatest and induced errors from the jig are reduced.
Remember that the jig is to speed up construction and help maintain the angular relationships between tubes, NOT to control tracking alignment. Andy
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