Ahh, thanks.
I’d forgotten the S1 had a fibreglass bulkhead, so that makes sense.
With the S2 beaverboard bulkhead there’s no really decent way to screw anything to it without using some large diameter washers on both sides . . bah.
I recall the interior light on my S2 used very spindly (1/8”?) screws that were about 2” long. Those are the only attachment for the carpet covered masonite trim board on the inside of the bulkhead. Pretty hopeless, really.
Noise? I think I’ve commented elsewhere that the S2, at least, is much quieter than an Elise, though that’s not much comfort, I guess.
I’m no sound engineer but I don’t see any obvious way to tame the noise in an S2 either, and I suspect it’s not much different from an S1.
I’ve contemplated sound deadener like that “B-Quiet” under the forward section of the engine cover lid, but it also seems likely there’s just too many holes.