Brian
I put inspection ports near the pitot tubes (I have 2, one for the AFS panel, and a back up to a steam gauge ASI). I've used them both. I also have an inspection port near the rear bell crank, but I'm still flexible enough to crawl into the cargo area and haven't "cut it out". When you come down to ABQ, I'll show you what we did.
BobRS
SS7, Trigear
Flying N104Y, 914