The way I see this matter is that the captive nuts with their AN3-5A bolts don't
do very much load bearing after the ducts gets secured to the brackets affixed
to the front faces of the foot-wells. However quoting Nev Eyre, the captive
nuts and their bolts are there to help minimise the tendency of the duct to
"nod".
This seems all the more a good reason to install them as per the manual in the
first place and to mount them in the most effective way (as per the manual) to
resist shear loads effectively.
Mounting them higher up as you describe would probably work depending on the new
position, but why have that bother when all it takes is a little care to install
them correctly in the first place?
If the front of the duct rests on the top of the intake "gob" in Nev's excellent
cowls, then the "nod" consideration is pretty much dealt with.
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http://forums.matronics.com/viewtopic.php?p=466605#466605
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