MOTM

I also have done some serious woodworking.  I would agree with the 
idea of trying to stay away from using solid walnut (or any other 
solid wood such as cherry) on long pieces.  I would use high quality 
walnut plywood with solid edging.  
I have a good friend who is a professional woodworker who grew up in 
Hungary and learned woodworking the old fashioned way.  He likes to 
make cabinets with walnut plywood.  He cuts edging material about 
1/8" thick on a table saw out of solid walnut and glues it on after 
making sure the edges are perfectly smooth by using a joiner.  He 
also always uses solid wood for trim, but uses plywood for any large 
or long pieces such as sides or tops.  
It can be done using solid pieces, but I'm not sure of the 
technique.  Something to do with gluing together several strips with 
grain running in opposite directions using biscuits.
I also would recommend using hardware which would allow easy 
knockdown and reassembly.  Almost any woodworking catalog has a 
number of fastening systems which can be used to simplify assembly, 
but still make an attractive cabinet.  Many of these systems use 
grooved pins and locking cams and can be entirely hidden from the 
outside of the cabinet.
One other thing to all group members, PLEASE be very careful if 
using a table saw.  I have personally seen people get hurt.  Cutting 
1/8" strips can be done safely, but too often these tools are used 
in a dangersous manner.  I will be the first to admit I have taken 
shortcuts myself on occasion at the expense of safety.
I know a lot of you have made your own cabinets as have I.
Please be careful!
BTW, I am most interested in seeing what Larry comes up with.  
Although I have built my own cabinet, I am outgrowing it and it is 
pretty unwieldy.  Although I might start over and build some more 
cabinest myself, I might also be interested in purchasing a cabinet 
kit.