help hacking harman

I am gutting an HK550vxi for the amp. I have successfully removed tone, volume,balance,rec,tuner,phono RIAA and RCAs and rewired it to a single RCA input. Sounds great, now I am building a new enclosure, changing the speaker terminals and power switch. The new enclosure is mostly made of wood, the only metal in it is the 1" amp riser and the back panel. The amp board currently has a ground to the metal chassis, can I connect this to the amp riser and back panel and call it good? I could also make a small chassis to contain the transfo, ac power input and inputs outputs but that would be harder and it takes away from the fast and dirty hack aspect....When this one is done I have a Denon AVR3300 with a 5 channels at 105W/8ohms that I need to gut

Thanks