This was a real repair mission, as the top deck had disintegrated.  The extruder wants to live near the center of action, so that became a serious problem.

I solved this with some additional 2020 extrusion and adapter plates.  I still needed to hold my spool holder in place, as well as the extruder cooling fan.  As a bonus, I made some wire ways to keep things a bit less messy.  The design looks like:

and the top end of the printer looks like:

and:

for the wire ways.  Note that the extruder is just velcro'ed to the brackets, as it makes it a lot easier to fool with the filament path.

The spool holder is something I came up with that I call a Dessicase, as it keep the filament sealed and dry while it's in storage, and pretty darn dry in use because of the long PTFE tube and dessicant packs inside the bag.  Note that the fittings are printed.