It's ok to disagree on this stuff. In fact, that's what brings out the solutions like this. Otherwise people who have found solutions sit on their hands and no one else hears of it?
I think your guy is going to be very busy? Works for me.
What's his contact information? Without that, a post like yours is useless and seems to me, a little confrontational?
On the "L", if you mean a single pod US dash, aren't they plastic and crack? My 73 is an L and came with a dual pod, so calling a single pod an "L" I don't think is entirely accurate?
Those are the ones that need to be replaced? The replacements are just fiberglass I think, unless you can find NOS.