RE: WACO YMF
Dan,
The manual and the plans say all the ribs are 1/8" stock not 5/32". Save some weight and $$$. Suggest making a good accurate template of the parts (1/16" to 1/8" ply, light aluminum, etc.) and use this to cut you ribs out. You can save the template to make another plane or as patterns for repairs.
On your saw, square it up if you can, place a square against the blade and table. A simple way of checking is to take a piece of thicker stock, make a cut and flip one of the pieces over top to bottom (180°) and push them back together. If it is square, the pieces will fit, if not you will have a gap and will need to adjust your saw accordingly.