I would take a hard look at a 20” CTR. Not quite 6.5 lbs bare though.
Their factory stocks feel and work great, for me anyway, and I doubt you’ll outshoot one by much even with a custom barrel.
Seekins Havak sounds close as well, for considerably more than the CTR.
Seems to be very similar to what you’re wanting your Winchester to become. Just a thought, nothing wrong with building though
I’ve went from 2 piece bottom metal to blind mag on Winchesters before, no big deal, just need a trigger guard and mag box, both of mine came from Numrich.
Unless you need to go below 2lbs, I would skip the Timney.
Lots of really good 6.5s out there now, that’s very close to what yyou are describing. Worth a look anyway, especially if you’re not sure exactly what you want. I’ve been down that road several times and have lost a ton of money in the end.
