The jig is a little spendy, I'm thinking that one could cut the mortises, should say might cut them by using the Jessem Doweling jig. You would set it up and drill a hole or two and move the jig slightly, clamp it, drill again, and move it a little further until you have the mortixe cut to the length that you want. Then set the drili in the jig and move the jig, with bit turning in it, back and forth the lengtth of the mortise to cleani up. Might be to clumsy, just an idea, will have to "experiment" and see what happens.
You would have to make your own tenons but you should really do that anyway. You would also have to be careful to cut the the matching mortise the same as the first one, but that should not be much of a problem.
Works in theory of course, you never find the fatal flaw in an idea until you try it..
Last edited by Jerry Bowen; 03-31-2015 at 12:24 PM.