Now, that leads me off in a different direction...given that Lexan (and Plexiglas, wood, etc.) aren't electrically conductive, then there wouldn't be any eddy currents induced by the magnetic field from the transformer. The eddy currents themselves induce their own magnetic fields that could arguably influence the signal.
Hmmm...
Could a plastic/wood enclosure actually sound better than a metal one? Granted, it wouldn't be a as strong mechanically, but most of us aren't going to be shipping our units anywhere; once they're installed in the system, they'll rarely move from that spot.
And I thought I was using wood for the Alephs simply because I've got a wood working shop instead of a metal working shop. Perhaps I was ahead of the curve.
I know Petter is keen on the idea of using brass mounting hardware for transistors instead of steel, since it's non-ferromagnetic. (No, I'm not going to suggest the use of plastic screws to mount devices...) This might be a step futher along those lines.
Yes, plastic can be tapped fairly readily. I did it as part of my fiddling for the water-cooled project. True, I abandoned that approach, but not because of problems with threading the plastic.
Lemme think on this a minute or two. This idea might have more merit than I first supposed.
Grey