Hi
Hope these panel templates, with more readable dimension for the panels to fabricate the splash shield, are more helpful
Note the 1" holes are meant to over lay the side panel mounting bolts, with only 2 of them being used to attach the panel. The tap toward the front is bolted to the radiator frame using a carriage bolt with a thin nut to capture the bolt to the radiator frame which is them over laid by the tap with large washer and nut.
On the bottom panel the two 1" holes over lay the frame rail rivets. This edge is covered with some anti squeaking material to allow for cab movement.
Front of the shield just completes the enclosure.
As mentioned having both Splash Shields in place forces the air from the fan to flow through the engine dog house without all the air from the fan being exhausted into the wheel wells. Did some testing over the weekend in 80F air temp on long 10%+ grades down in second gear to see if it improves engine cooling or not. No clear difference.
Cheers Phil