Your next frame would be fully custom, I assume.. chip. then you can tell the builder what you want item by item.
For now you can change the components and set up on what you have.. that is what we mechanics have done...
For decades..
I have an older frame built with those over the BB cable guides , and another with them running under,
same FD, the over the BB has a 52-42-26 ,
if it had the 50-40-24, the lower tip of the front mech would snag on the shift cable on the over the BB frame..
....
Last edited by fietsbob; 11-26-17 at 10:33 AM.