IDEX build has been half apart and back together a couple times.
I had to flip both x steppers back over so they hang under instead of sitting on top. I do not understand, but I could not get the kinematics to work correctly with them on top. I reversed motor direction in software, homing direction, physically reversed wiring, etc. All combinations either lead to having to home toward the front or move 0,0 coordinates to the back. I gave up and redid the back assembly and belts, etc.

It is still irking me.
Trident Z axis conversion is complete and everything is working correctly. It really opens up visual space (and real space) on the sides. Original plan was to incorporate spool holders on the sides, but there was enough room in the back. They are far enough back that oozing filament can't drip on them. Only problem is that the bed has to be all the way up or down to load filament. Swapping rolls in the middle of a print may not be possible. The spool holders are mounted with removable t-nuts, so nothing is set in stone. There is just enough room on the side for a 5lb roll from Keene Village Plastics, but it would be super close to the bed. I had a piece of textured ABS that was the right size for the bottom panel, so I went ahead and added it. I will probably change it to aluminum composite later.
Still haven't wired the toolheads. Not looking forward to it. The silicone wire I planned to use droops instead of arching like an umbilical. It will take a lot of wirres and I have not found the perfect toolhead connector yet. I happened to come across a new BigTreeTech canbus pcb for "introductory pricing" which was not much more than simple "Voron" connector PCBs go for. So I ordered a pair. I will be in over my head with the canbus stuff, but it would mean only having to run 4 or 6 wires to the toolhead instead of 17.
I was also tempted by this Biqu hotend kit hat uses a proprietary "USB-C" cable for all the hotend connections.
https://www.aliexpress.com/item/1005001995220414.html?spm=a2g0s.8937460.0.0.6b772e0eARS7X4I would have to order a bunch backup cables though, because you probably won't be able to get them in the future.

Not much else is going to happen until I wire the toolheads so the actual IDEX testing can begin.
I am fiddling with the camera mount and lights to avoid working on the wiring.
Was going to start on the insulated enclosure, but all the local big box stores are out of 1/2" polyiso. Might break down and use 3/4....