you can get good radio area patch panels from the repro places, only
$70 at Carter - much easier than replacing the whole thing - problem with replacing the dash, aside from all the work drilling out the welds and futzing with the brace that positions and secures the steering column, is the pinch welds actually make up the flange that mounts the windshield rubber, and not easy to get back just right - the windshields are picky enuff fitting without modifying the surround
but yeah, can be done if you really can't patch the damaged area, but get yerself a good spotweld drill
Bill