Mine isn't next level, just a poorly done copy of Perrow's

It's indeed a challenging build, not so much space to use and everything must be well planned before the building process. Perrow's work is fully detailed to avoid all that planning, and I was going to use all that info. But since I used russians tube (with different pinouts) I had to do everything from the start, and had to make a few decisions (including no tonestack nor bias switch, since I used a low gain preamp tube) which resulted in a amp different from the initial plannings. The most important things are: 1) it works; 2) I really enjoyed the sound

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As stated at Perrow's Superfly page: Measure 42 times drill once.