[SML] Building custom DMX relay box

[Joe]

I am working to make a custom DMX to Relay box.  The circuit board has Relays installed, and the power connections and DMX connections are all screw terminals.The reason I am not simply using a dimmer pack set to serve as on/off only mode, is that I have both 120v and 12vDC voltages. The 12vDC will be to trigger sprinkler valves that are part of two air-cannons. The 120v will be to power a miniature xenon strobe.   Though, perhaps I can use a standard dimmer pack, and just plug 12vDC power supplies for the two channels I need the DC control.  I am a little concerned that the inductive relays on the water valves may not play well with my 12v wall warts.  I suppose some diodes at the solenoid may solve that.
Note that the DMX, 3-channel Relay module I have, has screw terminals for all in/outputs.
When I have made a similar custom pack in the past. I obtained some XLR Panel connectors.  But, drilling the holes in the box was both frustrating and not really good enough, even if I got it to function.  I looked for, but didn't find any generic pre-punched panels to attach the two XLR connectors. Though, I did find ones with 4 or 8 locations.Also, the box has to provide for the 120vAC, and 12vDC in/out.  In the past, I just used cut extension cords, with a strain relief. The 12v was easy, just a circular panel mount outlet.
I feel I am somehow not finding the right stuff to do this easily, and professional looking.
As I wright this, I think I am convincing myself to just use a standard DMX dimmer pack.  But, decided to go ahead and post, in case anyone has anything to suggest.
Are there any 4-channel dimmer or relay packs that are for lower wattage, and so are packaged without the weight/size of the higher wattage units?  Perhaps in the form factor of a power strip? I know heavy-weight often means rugged. But there is also a kind of ruggedness that comes with things that are small and light weight.
-Joe
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