What is this all about? Looks like a real MickeyMouse single speed setup of some kind. Unless you can easily thread a Derailleur bolt into that hanger I would not buy this at any price.
As for building it.... I agree with the above look for a donor bike. Also you are somewhat limited to a 6 or 7 speed freewheel or cassette hub on this frame. You can't coldset it (have the rear triangle respaced) to accept 8+ speed wheels.
One last thing without all the original black Suntour parts there is nothing special about a BlackLightning
__________________
“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk