RCU problems again, unable to load images and screens locking up. Look at picture #4 above for ply doublers.....

One other thing not shown in the pics, I recess my spruce rails down an additional 1/8" below the rib and epoxy on a U shaped 1/8" ply on top, locking the two spruce rails together. Also, it is important to place the end grain of the spruce rails horizontal. If you run the end grain verticle, the rail WILL split when screwing down your retract.

Of course I have an illistration of this but again the uploader function is DOWN!