I have the same cart set up in a similar fashion for 3 gun except that I use a larger MTM dry box that sits on the bottom shelf. Wing nuts, washers and longer bolts (with some spares) solved the handle issue.
Yes, tHe G34 mags will fit in a G19 but will extend out the bottom of the grip of the G19. Check the overall dimensions for a gun in CCP as the G34 mags may be too long.
I would check this first...
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What is the suggested OAL for the 125gr flat point coated bullet in 9mm? Thanks.