I had a head start, studying product design at college many years ago but even then I manage to fuck things up. A lot of this stuff is very much plug and play. Then I ask lots and lots of questions and there are a lot of helpful people out there. I'm not an electrical engineer but I do know some good ones so that helps! All I'll say is that you could pretty much do what I've done here with a bit of patience and planning!
Nice project. You have inspired me to maybe try my own version.
Did you come across a suitable smaller case in your explorations? I don't need the "amp" part of your project but like the rest, meaning I could use a smaller case. DIY cases are plentiful I know, but I like your re-using an existing HiFi product case.
If you like the "old skool" style there are some shoe box size cases made from extruded aluminium with a U shaped sleeve that are very high quality. I think the guy selling them has stopped making them but you may pick one up on the http://www.pinkfishmedia.net
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Or you could look at the new Naim shoebox sizes like the NAP 100 or Stageline and try to pick up one that's not working?