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Hi. I have extension cables on my printer. In fact in the picture you can see the chrome connector just hanging at the bottom of the picture.
I think it would be very tight to do it without an extension and may require removing some links from the drag chain and not being able to get to the full 400mm height.
For the upright bottom bracket and the chain links I think 100% infill is needed for strength. The bracket that is under the X stepper could probably be printed with lower infill.
Hope it helps.