Here are the parts, where they go and their dimensions. You get to work out where to put the carriage bolts and the corresponding slots on the various modules. You can use just a nut to lock parts in place or go with star nobs if you want to make things easier to set. I've also left it up to you to decide the stock hold downs you want to use - they can be as simple as some clamps or some of those $10 toggle clamps.
And here's the sheet layout for the plywood parts.
OK - go make one, play with it a little and discover the advantages of Loose Tenon joinery.
If you have any questions e-mail me me and I'll try and help.