I think a really great option for the Curebox would be if you folks offered a clear glass or polycarbonate tank that fits tightly within the cure chamber... one that can take the 60 degree C temps the box can attain, and that can be used to cure prints without exposing them to oxygen.
I have tried to find one on the open market and everything is just a narrow miss- either too small by a significant margin... or too big- that the door to the box has that magnetic catch that stick down into the doorway is not a help, either- in future iterations you should have the catch extension on the DOOR rather than the opening- i.e. opening the door moves the catch with the magnet out of the way of the opening.
But if you offered a water cure tank custom fit to maximize interior fit- and with a slot on one side to allow it to clear the door catch... I am sure MOST of your customers would buy it.