From what I have been reading the sbn treatment thin tho it may be, is quite tough. I am hearing reports of bench rest guys getting 5000 rounds or more from there treated barrels.
I see what your saying about plating my own barrel tho. While I could do the plating I could not do the machining to remove the extra material from the bore/chamber before plating.
All this so I can shoot a few thousand more rounds before I have to change barrels.