The LBS is always an option, but given that the OP has done the hard part already, there's no reason to pay an LBS to finish the easy part.
The BB shell was already faced, and if the OP raised some metal, it can safely and easily be filed flat. Only a high spots create a facing issue and a local low spot or two is meaningless. Otherwise the threads are in excellent shape, and need only minor dressing. The OP's welding isn't a work of art, but I assume a bit of simple file work is well within his skill set.
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