I haven't made a hole in a drum shell since I misplaced my good screwdriver and hammer. For what it's worth, I think you made the correct decision. The fact that you hesitated and asked tells us that you had doubts. Good move.

Ultimately, it's your drum and you should do with it whatever makes you happy... but if it were me, I wouldn't drill it. Here's why:

First, if you ever do choose to sell the drum, the value will have gone down if you've drilled it.

Second, I was never a fan of the Gretsch rail mounts. I've got a '50s RB kit, and I started off mounting the 13" tom on a snare stand. This killed the resonance, so I jettisoned that idea pretty quickly. Then I started using the original rail mount, but found that the positioning options were limited, the tom was wobbly, and it was just generally a pain to use. Finally, I bought a Pearl ISS mount (much easier to use and less intrusive-looking than a RIMS mount), and hung the tom from my crash cymbal stand. It's not a perfect vintage look, but I've been very happy. The tom resonates well, everything is sturdy, and it's easy to position at gigs. I actually removed the rail mount from my bass drum and don't use it.

As for the Gretsch cymbal holders... again, I'm not a fan of drilling valuable drums, but I do love my bass drum cymbal mount. I've heard of others having bad experiences with theirs, but I've had an old K mounted on mine for 15 years without any trouble.

Let us know what you decide to do! [EDIT: for some reason I didn't see that you'd made your decision before I posted this. Good call.]

good choice - keep it virgin man,

you cant undrill holes, play with rims or a snare stand for a while and see if you like it. if you really hate it im sure you can trade for a kit that was factory with the consolette.

this is an on going debate, im not a collector but i heard this idea once which made a lot of sense to me -

vintage american drums are an integral part of the worlds musical history; and nobody can own history they can just be lucky enough to look after it for a while

I'm late to the discussion, but you could also consider a vintage 20's/30's bass-to-tom clamp. If you are unfamiliar, it is a tom holder that clamps to the bass hoop, and then clamps to the bottom hoop on the tom. They won't handle pounding metal rock, but they are a decent compromise. Hard to find, but they show up from time to time on ebay.