My first set was a BDP RK kit with 26" BD......
At the time (circa 1968), it was cool to have the heads off your drums,and have them painted some cool color inside.....black/red/orange.whatever.......
I took India ink,and did the whole inside of the BD...........
At least it wasn't thick house paint!
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I remember in around 1970's,I bought a bunch of stray drums from a friends older brother..........
There was a Rogers 6 lug snare in Duco,and I remember making it into a mounted tom to put on my MIJ BD........so,extra holes.
I had a double bass set of all sorts of brands cobbled together...........
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Lastly,after seeing Spirit in concert,I had to have a HUGE BD on stands on each side of my kit...so,somehow,I found 2 Ludwig vintage single tension BD's,and I found some big metal racks out in back of a grocery store.....
My dad welded some short metal rods (2"-3" long) on each side of the stands to go inside the drums,so I had to drill 2 holes in each BD to mount them........
So,if anyone sees some 26 or 28 BD's with 2 holes in them about the size of your thumb,Hurting you can guess where they came from,and why they are in there!