A Zenith that nice often brings $200 at least, so I assume a package of chassis/speaker/bezel and knobs is at least $100.
I found a Philco 118X cabinet in fair shape abandoned at a swap meet, then paid $25 for a chassis, and other $35 for a speaker and knobs.
I still need grill cloth but its a complete future project.
Unfortunately I rarely see a radio cabinet like that missing its chassis, empty boxes are usually 40s-50s TV s and console radio-record players
where somebody tried to re-purpose the furniture part
BTW I have two really nice chassis in search of boxes too.