Thanks weisn and panerai for the inputs. The further jump in price from Yuki's $500+ to Phongs $1,000+ is a bit of a stretch from my original MBW budget, hahaha. But most definitely Phong is the ideal (lest a gen case).
By the further explanation, it seems that building a 5513 is much easier than 1680 given that MBW's are engraved 5513s and lack of a date window. But the T127 top hat on 1680s is a striking killer look for me that I can't put on a 5513 that uses T19. I'm also having a hard time sourcing a 1520 at the moment. Is it correct to put a 1570 on a 5513? If so, from what year? I think I remember 5513 still uses 1520 by early 70's. Correct me 'tho if not accurate.