Here's a nice finishing touch for your MCS letter slot - some 1/4" hexagonal honeycomb metal mesh to keep out bugs, bats, and birds.
http://www.mnpctech.com/moddersmesh.html

BTW, while this page says 70% open area, if you click the "click to enlarge" link, it is actually 79% open, which should be minimally restrictive. It's a nice alternative to the gutter screen that is widely used.

Sprayed black to match the cowl intakes, it should look very trick.

I've ordered a 12x24" sheet, so if any other four owners in the Portland area want to split the cost, I'll have a bunch left over.

 

I was looking around for honeycomb screen but at the time, couldn't find it. Thanks for the link. But already did mine...