I've had a few blackbox's in the past two of which were commercial options, the Asus B202 and a Fit-PC1. A blackbox by nature should be small and robust designed to be shoved somewhere and "just work". The current 'blackbox' needed to acquire & route Bigpond Next G signal through both a wireless and ethernet interface. It also needed to run remotely and therefore by powered by DC voltage. Linux compatibility of hardware. You could do any manner of things but this is what I went with: M350 case Intel D510M motherboard Pico PSU dc-dc version 2.5" Laptop drive (sata) 10/100 low profile Realtek NIC Azurewave AR-5B91 mini PCI-e wireless NIC 2 Mini PCI U.FL to RP-SMA WiFi Antenna Pigtail Adapters DDR2 800 ram Most of the stuff, pics and info is listed at http://www.mini-box.com.au (it's not where I bought from). You can find a lot of it locally, or on-the-net depending on how much you want to pay - I'll leave that up to you. To fit it all into the case required some tiny mods, very simple and repeatable ones, which is what makes it a good choice of gear. The back plate and inside 'before' pics. Click to view full size! Click to view full size! The is where our first problem occurs. The motherboard has a PCI slot, but the case doesn't support one. Also the area we need is the STD position for the DC power input, so we'll need to move that. Click to view full size! Simply take the mounting bracket off of your ethernet NIC and cut it down to size, then use it as a template to cut a hole in the case. You will also need the make the centre hole in the I/O plate larger to suit the DC power socket. Click to view full size! Throw it altogether now. The pico PSU mounts like an older PSU plug using only 20 pins instead of all 24. The SATA 2.5" drives mounts upside down to a plate supplied with the M350 m-itx case. Click to view full size! All done now, not room to swing a cat though... This shot shows the two external sideways mounted USB sockets which hide under the front clip on cover - handy if you don't want them bumped and it saves on overall length of your project. After all it's M-ITX format for a reason right !? Click to view full size! If you remember back to the project scope outline it had to route a Next G connection, it lives under the front cover and uses an external yagi antenna so we must allow for a patch lead. You need to notch out a groove in the base of the front cover for the cables to pass through. Click to view full size! Click to view full size! Power is supplied by 250 Ah deep cycle batteries. Our batteries show a full charge level, with a voltage of 13.85v Click to view full size! The battery box is a free broccoli box with lid. Batteries don't like to be cold (produce less power) and they need a spill container - so use something that won't leak. I wired in a fuse & amps meter to work out the wattage being used during the testing phase. Click to view full size! The draw wasn't too bad for the working system. It will draw 2 amps under load while writing to disk. Click to view full size!