Home Made Mini D

Surely a punch or screwdriver etc hammered in from the non lock end of the bottom bar would either shear the padlock loop or break the metal around the hole in the locking bar pretty quick.
What about taking a standard dlock, cutting the loop down and re-cutting the notch for the lock into it?
Shoulda made two of em and desruction tested one yourself rather than leave it to some pikey to test when its locked to your bike.

How if there is a cover welded on that end?