You might be thinking of the older Gladiator frame, or the ancient Swordfish...
While the Hurricane did have a tube frame, that's not the only thing it had. The forward tubes were hidden under the metal skin. The aft tubes had to supply not only rigidity but structures. They had to prevent sagging (if the tail sags, all of a sudden the stabilizers are at a different angle, cables sag and all of a sudden elevators no longer work, etc). They had to withstand Gs and violent manuvers as well as hard landings.
It's not like they were just a hollow box frame. For example:
To show you how busy the inside of this thing was:
The outer ribs actually were part of the reinforcements:
I don't know about you, but that's a LOT of stuff for a cannon round to hit, and it's so densely packed that any cannon round will do a lot of damage.
Whether that damage meant the tail came off, or the tail stayed on -- that's another story (i.e. B17s were known to make it back with astounding damage, same might be true for Hurricanes). However, I doubt the myth that "rounds passed through the fabric tail" or "failed to detonate in the soft wood" -- there's too much for that to happen IMO. Too much to go wrong with any amount of damage.
There's a reason everybody switched to metal skin. It was stronger and took up less space and weight in most cases.
EDIT: But this is all a side-track to the original post... Sorry.