I've got a Hustler chassis that I rebuilt that I love. Someday I'll either find or build a cabinet for it, maybe with 2-10".
The reverb is driven in current mode by the opamp so the input of the tank must be isolated from ground. If you look at the schematic, you'll see that the tank is part of the feedback loop of the opamp and is isolated from ground by a small value resistor (47 ohms maybe?). The output of the tank should be grounded to the case as is normal in most amps.