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Check out this retro home-brew 7cm oscilloscope. It was beautifully designed and executed, down to the mahogany housing and exposed CRT.

I like this engineer’s attitude:

The choice of tubes is somewhat arbitrary. The EF91 would be very suitable in all three functions, since among small-signal pentodes, it is unusual in having suitable characteristics for providing a relatively large anode voltage swing with little distortion. But I do not find the EF91 visually attractive, so I opted for the other tubes in the main functions, relegating the ‘91 to the back of the chassis, where its smaller size fits in nicely.

If you want to build your own, he includes a schematic and parts list (at the bottom of the article).