I pulled the chassis tonight, took a bit of elbow grease but it eventually slid out. Looks relatively unmolested, lots of ceramic encased paper caps and bumblebees. I already see a cap which wasn't listed in the Sams, a .0015uF ceramic.
The CRT is branded Channel Master, appears to be a rebuild. I also spy some non-Zenith tubes littering the chassis (the horizontal output and damper tubes are GE), so it's obviously got some hours on it, but nothing appears to be majorly worn out.
Parts are being shipped right now, so I can hopefully start recapping in the next few days...