Paul,
To answer your second question that no one addressed, for the vertical space between shelves for your GG1 with raised pantographs, just measure what your GG1 height is and then add a small "safety factor" to avoid an oh crud moment later. For my shelves I did just that for my K-Line interurban sets. See below. At 6" apart, top rail to top rail, the raised pantographs are about 1/8" below the base of the shelf above. Done deal.
Tom