Not saying to abort your plans for a bigger toolbox. But I find I use my hammer and spud wrench all the time when swapping out 3 point implements.
I mounted them on the ROPS for quick access. Works well for me!
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That's what I mounted30 cal) on my MF135 port side running board, did that perhaps 45 years ago and it's still as good and the day I mounted it on the tractor.Metal ammo box might fit your needs.
Saw an inch or so off the hammer handle.The toolbox on my Kioti won't fit a hammer and this offends me, therefore I'm replacing it.
Saw an inch or so off the hammer handle.
Bruce