I had a look at relocating the PCB holder (Qidiot gave me the idea) for Icarus, there definitely is NO space for that in front of the blower fan, not without redoing the whole parts cooling system and relocating the blower fan. It would hit the Orbiter extruder.
Current design stays, I'm very happy with it.
Hercules is larger and the BMG extruder is slimmer in that direction so it would work there but it would be in the way of extruder access, I don't want that and I see no benefit in its relocation anyway.
Both designs are stable and pretty much final, at least for the 1.X series, who knows what the future brings?
The only changes I have planned at the moment are to the ribbon cable holders. Adding a heated insert for Hercules and possibly straightening them both up now that the Automatic Ribbon Cable Holder is released.
One thing I haven't really spent time on is the parts cooling fan duct for both setups, they're originally remixes and I will redesign them properly from scratch, I think they can definitely be improved.