I did the same as white_is, and cut my barrels myself as there were no local shops with the capability to cut them, or they wanted to charge out the ass to hand-cut them. So I took my sweet time, cut directly in the center of the weld and it worked out great. Once they split, I ground down the rest of the weld and scuffed it smooth.
The lips - 17x5" made by wheelflip for the BRW03 face. They did a great job, but took quite awhile to make them, and I had to email them consistently for any type of update on them.
My cut barrel
Before and after
I did not reweld mine either, but replaced the hardware and just siliconed them. I didn't drive my car alot, but I've had no problems at all.