The perspex top plate on my printer broke, here is the drawing I created that moves the spool holder to the inside of the printer above the delta arms.
It also provides mounts to move the extruder steppers much closer to the print head and considerably shorten the bowden tube length.
Thanks to Rob for helping me with initial drawing.
Get drawing cut out from 2 or 3mm aluminium plate (suggest water cutting).
6M4 screw and nut to connect spool holder to top plate
1-3 rod for spool holder with M6 thread (depending on how many hot ends you have)
Relocate bowden steppers to bottom of bracket (Assumes EZStruder mount made by clefranc https://www.thingiverse.com/thing:672280)
Use existing screws from top plate to secure new plate to top of printer