Thanks guys, much appreciated.
Now, today I went to my PMS meeting, this is what Annie refers to them as, (IPMS). There was a prize winning P-40 there, and the holes were in place! He had no idea what they were for, had no idea of ground wire or the floppy tubes. I think the tubes are retrofitted relief tubes!
However, the wire on top was speculated to be close in approach radio antena! Something to receive weak signals for approach to land. Make sense? Dunno, something to search more for.
Meanwhile, I remove the holes. I looked thru many ref books at the meeting today, and nada, not a one with inspection ports.
I sailor on.