Very nice !! I love the look of the bent wire in the first picture. Simple and original.
Can you also show us the post that supports the unit? I want to understand how this works on the Valoy.
I have done something similar with the Valoy II (replaced the redfilter with a Beseler filterholder). And also with the first version (no filterdrawer) Focomat 1C. I have left out the redfilter because I never use it, but your solution will help those who do.
So nice to be able to print with these beautiful enlargers.