I've been putting screen in the valley for years..
I use a 1/8 mesh that I buy at the hardware store..
its metal(sorta like large screen door screen).. I
cut it to fit and run it up the back wall on my small
blocks..JB Weld to glue it in place... its saved my butt
a couple of times when stuff broke.. rocker parts and push
rods and lash caps.. I'll see if I have pics but I doubt
it.. no one normally wants to see stuff like that