My Sound Dampening Enclosure for almost finished CNC Router

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I think the idea of sound proofing is good, but I also think that the table is not going to be strong and rigid enough for a CNC and that the rubber wheels will make the whole machine too shaky. My CNC is made in a similar way but out of 45x90 aluminium extrusions and originally I also had similar wheels, but after some use I realized that the shake is just too violent when the CNC was in use and that it also affected maximum speed and accuracy, so I changed the solution. The table is now lowered onto the floor, and the wheels are only used when I want to move it around, which is not happening that often. Also, the noise level actually dropped after the change, even though the aluminium extrusion feet is not touching the floor, resting directly on some wooden blocks between the floor and the machine feet. My advice it that you think about this before it is too late, so you don't have to make too many changes later.