Hi carlj,
The half moon “wings” are part of the negative carrier, they locate the carrier and allow it to turn for portrait or landscape orientation. My panel is mounted above an 11x14 picture frame that I got from Target that sits on the carrier, so the LED panel covers just fine.
Currently I just hold the Ilford filters (6x6 I think?) under the lens. I am going to make a holder out of some wire and mount the filters in gel holders going forward.
As far as exposure times for larger prints it’s just math- once you know the magnification and time you can calculate further magnification times (Kodak made a handy calculator in their data book, I usually use an Ilford enlarging light meter though).
I got new styrofoam for my mixing box too! Not that many parts are available for the old beasts.
I have a Time-O-Lite timer that will handle the wattage of the dichro head (1000 watts? 2000? I don’t remember). I got the timer in a box of other darkroom stuff but it handles the high wattage. Of course for the LED it doesn’t matter. One thing I was worried about were start up time variation for the LED, turns out it’s nothing to worry about, exposures have been consistent.
Bruce