WAYNE - On the underside baffles, make them from the thickest steel you can work with, I recommend something around 1/8 inch thk. On my 38" deck I made them 2 inches tall, they extend from the under side of the deck to just below the cutting edge of the blades. And the closer you can get them to the blade tips the better. On my 38" deck I have them about 1/8 inch from the blade tips. And I welded them SOLID to the deck and reinforced the points of the arcs where the baffles intersect with angle iron, but flat stock would work good too.