I should also mention that I'm not particularly interested in getting an amazing playing amp from the vibrochamp build, but really want to have a small relatively simple amp circuit to play around with.

I'm treating the amp builds the same way I have been treating the pedal builds - each one should be more complex than the last, or teach me something new. So, the vibrochamp is pretty simple in terms of components but it has the vibrato and if I build it into a larger box I have room to play around - make a list of amp mods and just work my way through.

For example, I'd like to add reverb. Not because I think it'll sound amazing, but because I'd like to understand reverb circuits better - what are the options, how do they work, how are they each different, what will or won't work with this circuit and why, etc

If I end up with an ok amp at the end, then great! But I have heaps of amps now and really just want to understand the circuits better. I figure worst case I make an awful amp but learn some things, then can strip it down for parts for future builds