Several people have asked about different S-100 enclosure options. Custom enclosures are often time consuming to get, heavy to ship, etc.
There was an article on Hackaday about making enclosures from FR4 PCB board - http://hackaday.com/2015/06/03/how-to-build-beautiful-enclosures-from-fr4-aka-pcbs/ While I think doing it with etched-copper clad board and a soldering iron as shown in the Hackaday pieces is not really an option for an enclosure large enough for S-100 systems (and a waste of copper board) - plain G-10 FR4 is readily available.
One could purchase a single 36"x36"x0.093" piece of black G-10 FR4 (http://www.eplastics.com/G10BLK-093X36X36) and cut it into the pieces required to make a 17x17x7" enclosure, and still have about a 5"x36" section of material left to make card guides, drive cages, etc. 5-minute epoxy from the store could be used to bond the pieces into the final configuration. With a simple PCB mill like the X-Crave, holes, ports, etc could be added (and maybe groves to guide fitting the pieces together).
An advantage here would be if someone made a kit, the G-10 pieces could be shipped flat-packed similar to the way we ship our PCBs and the epoxy purchased locally at a hardware store by the builder. Thus avoiding the shipping costs of a heavy and volumetrically large metal enclosure, which end up being a significant portion of the cost of any hobby enclosure project.
Andrew