There are a few topics on this forum about foldable solutions for CNC machines. Here is one I participated in, and I’ve seen others. Beyond folding, I’ve seen two other space saving solutions. I’ve seen machines put on a shelf under a work bench. I’ve also seen a pulley system where the machine was pulled to the ceiling by all four corners.
I have theoretical concerns about the deformation of the MDF and the plastic parts over time if stored vertically. To mitigate these issues, I would do the following three things for sure:
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I would remove the router when not in use. I’d probably put a hook on the base board to hang the router from to keep everything together.
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I would make the base board (the board under the spoil board) out of plywood, not MDF.
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I would provide mounted blocks of some sort for the butt end of the rails that will be vertical when the machine is folded to rest against so that the entire weight of the machine is not carried by the feet.
In addition to these three, I might consider:
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Printing the feet with more perimeters and a high infill than V1 suggests.
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Create a block so that the core is supported by the bottom (when folded) rail rather than resting against the truck.
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Print parts, especially the feet and corners, out of carbon fiber PLA.
Of course, my concerns are all theoretical, and, since the MPCNC is so easy to modify, you could take no precautions and simply address any issues when/if they happen.