@johnarthurkelly, @matthewepler - just another note. I used to do color enlargements (in the 80s of the last century). My enlarger for 6x6 cm negatives had an interesting light box design. It kind of mixes the integrating sphere design with the Direct Drive design.
Basically, the light from the color-filter stack enters a light-mixing box through a hole sideways. There is no way this light reaches the negative directly, it needs to be reflected at least once. This is the integrating sphere part, simplified.
On the open side of the box, where the negative is, there is an additional diffusor. This is the Direct Drive part, so to speak.
From my lab work some 40 years ago I can tell you that this illumination construction had an excellent homogenity over the whole area of a 6x6 cm negative.
The best part of this approach is that it is extremly cheap to manufacture and quite compact. The box is made out of cheap styrofoam, no additional coating applied…
Because of covid-19, I can not make some images of my old unit, I however found the description of a similar enlarger on the web (japanese-build, mine is german-build).
Have a look at this page, Saunders/LPL 4500II 4x5 enlarger.
You have to scroll down about half of that web-page to see the inner workings of this design.