Mike, have you considered making this a "we cut and deliver to your door" complete end-to-end service ? By this I mean supplying the materials, cutting from the drawing, disposing of the waste, and delivering the cut parts ? If you had an initial list of materials you can supply - including marine ply and aircraft-grade birch - this would increase its attractiveness as I am sure many of us don't want the hassles of having to arrange to ship a couple of sheets of 1200 x 2400 x 20mm ply for the sake of 1 job, chop that up to suit your cutting bed, then dispose of the bits left over.
Regarding birch, I don't mean the bog-standard grade I do mean aircraft grade, its a lot stronger than anything else short of using composites or metals.
Anyone thinking about laser cutting might like to take a look at the detailed instructions at
http://www.ponoko.com/make-and-sell/design-it-yourself which includes a useful video about how to make tight joints.
While Ponoko offer a delivered-to-your-door service, the materials, thickness and maximum size they can cut are not sufficient for making dobs so yes its good to see a local who can provide this.
Having tried this (with Ponoko) there are few notes to be aware of - these will be equally relevant to Mike's system:
a) carefully study the guidance on how to prepare the CAD drawings.
b) remember to allow for the width of the laser cut, especially where there are mating parts or joints.
c) edges are black, and not as smooth as cutting done by a CNC router so you may have some issues.
d) the burned edges may have a slight angle to them, ie they may not be exactly perpendicular to the face of the board. In some places this may matter, in others it won't.
Lastly, be prepared to make some trial pieces first - possibly a complete batch of parts - on the basis that it may take two or more attempts to get all the dimensions spot-on. For anything complicated the first attempt is unlikely to be perfect.
It's OK for simple boxes and you could cut the parts for an old-school dob this way, it would save a fair bit of mess at home.