hey Nick... all your effort has inspired me, and I'm making a simliar unit up....
I'm using a clear plastic box, mounting the meter in it, with just the RCA and power cables sticking out, and running it to m UA-5 batt pack......
actually, I just ordered all the parts, and my cousin, who rocks at soldering, is doing the assembley....
usinf a clear box to srot of protect the meters...
pix soon to follow....