Light weight MDF will work.
CNC is a bit of an over kill as you can cut all those peices with a table saw and jig saw but, if you have access to a CNC then and you want to take the time then why not.
Congrats on building your own box.
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 STILLEN G3 / F.I. TDX (NO RESONATORS) / F.I. LTH / UpRev Tuned / BC-Racing ER Coilovers / DIY Oil Cooler / Short Shifter
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