Power cable
I'm planning on build the famous Ikea Lack enclosure, however I have another plans to it. For my personal build I'll need to move the PSU to the bottom of three tables, since the middle one is going to be "another enclosure" but instead of using Acrylic, I'm using 6mm thick plywood in order to make a cabinet for the tools, filament and that sort of things... The problem is that I cannot simply stack both of them this way if I want to keep the PSU out from the enclosure. The PSU mounting part will collide with the corner part of the enclosure, even if I modify the parts to merge both of them I'll need to cutout the plywood to make some space to the PSU... Not so pretty.
REEEEEEPLYYYYYY
There is nothing special about the positioning of the power supply, other than it is near enough to the printer that the original power cables will reach. You don't have to use their mounting bracket to mount it where it the Lack Enclosure wants to place it. There are a few inches of slack so you can move it away from the edge. You might have to get a little creative, but I would imagine that designing a bracket for this purpose would be a good first project if you don't have any 3D cad experience.
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The enclosure I have has a fan to generate a slight negative pressure within the enclosure, and without generating any turbulent flow, and a vent next to the power supply in order to draw room air directly into the power supply to keep it relatively cool.
This also has the side effect of warming the air in the enclosure, in addition to that warming from the heated plate, nozzle, and other power-consuming components.
There is nothing special about the two 24 volt wire pairs. Make them as long as you like.
The wires are easy to make longer - just get yourself some 14 gauge zip cord and make two more. Crimp ends are universal - you can use spade or circle - doesn't matter. It's just a 24 volt supply. If you extend them, also extend the power failure control wire pair (20 gauge will be perfect).
The challenge you will face, others have learned the hard way here - again and again. The lack stacks are top heavy, and if you bump them of move them (don't even think about wheels) everything goes crashing into the floor. The forum is littered with pictures of the resulting broken lack, acrylic and printers in random looking piles of plastic and metal.