The Samshongsa Williams are just excellent candididates for detailing and upgrade to match almost anything. I gave $500.00 for a master piece Hudson and recently $350.00 for my cab forward. With parts not counting my own labor I'll have about $1,300 in the cab forward when it is finished.
I subsequently bought a new 3rd rail super Hudson for $1,300 and if 3rd rail had built an ac 12 cab forward for $2,000 I wouldn't be building my own.
The 3rd rail N&Ws are on the secondary market at very attractive prices currently and would make a better buy than almost anything else in my opinion.