Update:

I took all your advice and did what I had to do: drilled two vista concert toms and a kick for l-arm/leg mounts on the former and modern spurs on the latter. I went quite slowly with a brad point bit and had no issues except for slight chipping on the exit side of one or two of the holes. Then I used a countersink to add an bevel to the edges. Even went back and used a round file to widen the holes a little so the hardware wasn't too snug (and beveled again). Added a layer of neoprene between metal and acrylic, and voila.

Funny enough, when I removed the original tom mount from the kick to replace it with a new one, I saw how rough a drilling job was done at the factory. Must have been a Friday :P

Good on you for researching first, and then diving in!

Just one thing I thought I'd mention in case you or others didn't know...they make washers now that have a layer of neoprene fused to one side. They are cheap and available at Lowes or Home Depot and they are the perfect fit for drum lugs. They are slightly concave, and the hole in the neoprene is just a bit smaller than the washer so they hold everything in place while you fumble for the nut and the wrench. Best thing ever, I have been using them for all my restorations.

AL

Not a bad idea. If I end up stripping the shells to wrap them (they are boring ol' opaque black) I might do that when I put the lugs back on.

That reminds me: these are concert toms, and to me they look really strange without the aluminum trim ring along the bottom edge. And, it might not be a bad idea to have even that little bit of reinforcement where there isn't a rim and head. I have a set that I could put on, but that requires small screws to be threaded into (but not all the way through) the shell material. I've done some research about tapping threads in acrylic/perspex/plexiglass and I get a lot of conflicting info, unsurprisingly. Mostly, I'm concerned about the interplay between the acrylic and a tightly-fitted screw.

I wonder if through rivets would be the better call. Or, just leaving well enough alone...

No trim rings. They rattle/vibrate.

--just me I guess/ but on acrylic I wouldn't use screws or especially rivets as they spread force into the plastic.... an invitation for cracks.... I like concert toms with the rings so if I decided I 'really' wanted to do that I'd use epoxy glue/ but figure they'd probably vibrate loose later.... just my opinion! (I'd probably convince myself not to do it...)! Good luck and enjoy them now!