Yup, parts catalogs in the bathroom here too
I have the hammond case and I started drilling holes in it last weekend. My project has changed, many times. I really need a field mixer at this time more than I need a transformer based microphone pre-amp. So, I'm making a four in, two out mixer. The first input will be XLR or RCA awitchable, so that when I'm ready to add the transformers for the mic pre, it'll be set. I plan to use a very simple summing mixer to mixe the line inputs, so It will look very close to the Jensen pre-amp design we have been talking about. To muddle things further, i just bought a Rolls MX28 that I plan to modify, so Eventually that will be my line mixer and the project in the hammond enclosure will be a mic pre-amp. I'm assembling the parts , like good film capacitors, metal film resistors, panel mount jacks etc when I see them cheap on eBay or anywhere else. I have most of the parts, except the transformers for the mic pre-amp part.
One more thing to add... Jon, over at Naiant Studio has a summing mixer that he is working on it looks like it can run on 12v DC. He's looking for some more folks to maybe go in on a group buy of the circuit boards. I'm probably going to use the circuit he designed as the summing part of my project, with the Jensen transformers (eventually as the impedence matching and a bit of gain) for the mic pre-amp section. Give him a shout. I've found him to be very easy to work with.
Chuck