Split High Power Shaft into horizontal-to-vertical shaft turns and straight vertical power shafts
Right now you can only transfer power vertically only one step at a time without ability to horizontally rotate shaft stack output in relation to input (output always opposes input). To transfer power between three and more level you need to build cascade of High Power Shafts with significant footprint.
I suggest splitting High Power Shaft into stackable basic components (horizontal-to-vertical and vertical-to-horizontal turns, vertical shaft). It will simplify transfering power between various different heights in tight spots and make overall construction neater.