As for fire safety, recapped tube radios in cabinets of that size and material should be fine. I don't think bakelite will burn that easily, and resistors overheated are not likely to light anything else on fire. Think of it as any other box that produces 30 watts of heat to be vented.
As for electrical safety, some older radios are not up to modern standards. Some sets that had the chassis directly tied to the line had screws protruding thru the bottom of the cabinet. Or hot volume control shafts that depended on the knob never getting lost for user protection. If the screws are machine type, you should be able to replace them with plastic screws. Sheet metal screws are more difficult. Maybe you can cut a machine screw thread in the sheet metal screw holes, or solder or glue on machine nuts.
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