Stockard kit could be a good place to start. The Forecast kits in 6wt are under $100 for 2 piece and $104 for 4 piece. I think it's a standard Batson RX6 blank. It doesn't come with finish and you could get a different thread color if you wanted something different than the black it comes with. I haven't built this kit, but have built a couple RX6 blanks and like them. Don't know about multiple pieces and sinking lines.