Great Welding job, no pits. 
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‘MRsDNF’ you look like a First Class Machinist and Welder to me. Very Nice finish. 
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So have you had any problems running that 20mm mcpcb at 12v 8a with 8 x 18650 batteries ?
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I have a very similar driver from Lexel with that same setup in a MT35 Plus and have burned up 2 leds and 1 mcpcb.
Funny it is back on the operating table now getting machined and modded for a 32mm mcpcb now so it can be held down with screws. 
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