Yes to the front panels. Seen this done a few times, the WB lower aprons has to be matched to the H series front panel. The way Ive seen this done was to cut the bottom off the HZ front panel & fold a section & line up so it bolts to the lower aprons. I think the radiator support is OK as is. The dash Im sure could work, but cant remember seeing it in a HZ. The under panel mounting of the dash are similar.
Hope this helps, good luck

cheers
Max