I’m a union carpenter and I would use a stronger cheaper caster weel that can be face mounted and screwed onto the sides because what your trying to do will get expensive fast to have them retract up and into the cabinet. that or self leveling weels but if you don’t want to see weels all year...
I have several yellow tangs I would like to trade for large coral pieces nothing fancy but im filling out a large tank or fully cycled live rock caked in coraline