Sticks and glue
It seemed easier to me to get out the table saw and create the 4 panels to make a cabinate.
Perhaps this comes from watching Roy Underhill...
Considering how flimsy the standard U shaped sheet metal cabinet is, a 4 panel 1/4" box seemed to actually be an improvement. I know joe leppard quieted his 1-18 with cork or something on the inside panels, how much better to switch to a wood cabinate. If it isn't leaking, and if one is using polyurethane sealer, I would imagine it would work.
Historically, radios, TVs, ice boxes were all made in wood cabinates, the sheet metal was only a cost savings for the most part.
Anyhow, I'd never heard of anyone here doing that, but I suspect that there are some very capable wood workers amoung the crowd here.