The aluminum box to the left is 7.5" x 4.75" v 2". I believe that is the same size box used on the m148?
I have the rest of the stuff around from other projects. The bigger box (on the left) cost me $4.95 at a local surplus parts place. It has some holes already drilled in it, but I'll fill those and it will work great. I also think I may use the Neutrik NF2D-B-9 and NF2D-B-2 for the outputs, rather than the XLR's.
I may just go with the 6v SLA batteries after all. Building the charging circuit will be easier. Does anyone have the lowdown on the cheapest place to buy the PS605's?
Edit:
After looking at photos of the insides of the m148, I found it's the same Hammond case I have, 1590D. It turns out that my local surplus electronics store made a mistake and only charged me $4.95. That's the price without the matching top. Anyway, I'm going the start filling the holes and get it ready to drill holes in the right spots for the XLR connectors.