Why they chose to use a 6" galv extension instead of extending the copper, or using longer flex lines to the sink is beyond me. Perhaps they liked the rusty water flavor it provided when not used for several days?
All I needed to do was install the valve right at the copper line, using compression fittings so I didn't need to solder. Then I ran the flexible pipe from the valve to the sink and that was it.
After Inspector Scully approved my work, the hideous sink-cabinet was back in place and I was done!