Hello Chris. I'm contemplating building one of these too. I'll probably collect all the bits over a period of time and then have a go once most of it is all together.
I'll be interested to see how you get on.
Have you got a link for the case you are considering?
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Current system:
RPi + Allo Digione
Beresford Caiman Seg & Dorado powered by 15v Linear PSU
Transcendent Sound Mini Beast OTL
Amptastic Mini-1
Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
110aH Leisure Battery powers the Mini-1 & Digione