I've been playing with this for a while and have used it to build one set of cabinets. It consists of three stations. One to cut the mortise and two to cut the tenons. I used a 1/4" spiral upcut bit in the mortise station. The 2X4 push block rides along the front of the bed and helps to keep the tenon board square to the fence.
The second station is used to cut the face & both sides of the tenon.
The third station makes the back cut on the tenon. Face down on all three stations.
Initially, I made all four cuts on the tenon on the second station. However, if the stock is not perfectly uniform in thickness the tenon will be thick or thin and the face will not be flush. By adding the third station, the faces are always flush regardless of stock thickness irregularities. Tenons are always tight as well.
The bed is made from 3/16" X 3" angle and the fence is made from 3/16" X 5" strap. The routers are el-cheapo harbor freight 1/4" palm routers. They are roughly $28 with the widely available 20% discount coupons. The routers are hose clamped to 1 1/2 angle iron that is welded to the fence. The fence pivots on a bolt that is located on one end of the angle-iron bed and is height adjusted on the other end. Raising the fence raises the bit. Pretty simple.
I put a dab of glue on the tenon & use a 5/8" 23 gauge pin nailer and shoot it from the backside.
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