Yes, I have built many sets of fireplace doors. The hammered sheet metal I'm trying to source is for a set of doors I will fabricate for log storage next to the "store" bought fireplace doors.
My last resort is to make the hammered sheet myself. I prefer a "mechanized" hammered finish such as rolled, this will match the store bought doors best.
As of yet, I still have not found a source for the hammered sheet. I can find it in SS in very thin gauge, but no luck in 1/4" A36.