Here's the inside of the shells. American, yes?

I would say yes.

Yes, USA. Like KO said earlier, many of these shells were one long ply spun around several times. On the one 60s Kent kit I had, that was the case for the snare and toms, but not the bass.

Those were made on military road in kenmore, ny.

FWIW The wooden bass drum hoops on Kent drums were thin and tend warp depending on how they were cared for. The tom mounting hardware was nonfunctional in a modern sense so seeing these modifications on a gigging kit make total sense. What most people are interested in are the shells which were unique.

Agreed, American-made.

The wood grain runs horizontal as opposed to Japanese running vertical, which was easier and cheaper to produce.

My Kents looked just like that inside. A single ply wrapped over itself. I had a 20 and a 12 that I bought at an auction about 30 years ago. The two Kent drums came along with a Slingerland 14x14 and a Jazz Festival, all in red sparkle. I paid $25 for the whole works but of course all I cared about was the snare and the floor tom. I did use the Kents as a rehearsal set at our bass players basement. I'd bring a snare and some cymbals but left the Kents there. They actually sounded quite good. They still had the original heads on them. Unfortunately living in a damp basement began to take its toll. The metal parts started to corrode a bit and the bass hoops started to warp. Unfortunately I really just didn't care much about these drums and let them deteriorate . Eventually I gave them away to a friend of my mom for her grandson. I think he was eight or nine and wanted to play the drums. I gave him the Kents (still playable) along with a MIJ steel snare I had picked up at a yard sale for $5. He loved them and used them for a couple years. No idea what happened to them after that but I'd guess they finally met their end either by fire or garbage truck. Regrettable from today's perspective, but at the time it didn't seem like a big deal.

Back in the pre-internet days the rumor was that Kent was somehow connected to Gretsch, which sort of implied that the shells were maybe the same or similar. Obviously not, although...Kents are 100% maple while Gretsch are only 33% maple content. I think, at most, the connection might have been a couple of former Gretsch employees worked at Kent but even that I'm not sure about.

Some of the various Kent sets that have popped up in NSMD or pictured on various forums are quite nice. I wish I had taken better care of the ones I had.