Thank you for the replies.
Schmitt - Yes, I have all of the equipment needed to build and process these tubes. I've built quite a few triodes over the years and there is still a lot to learn as the designs get more ambitious.
Brian - Yes, YouTube is a great resource for DIY vacuum projects including building tubes. The Paillard video has become a tube building cult classic and I still enjoy watching his work. The best instructional videos are on Ron Soyland's YouTube channel 'Glasslinger'. Ron is a very talented person.