Hard lines length and size

I'd think the only way you're going to get a real close to factory look by bending the lines yourself is to have an old set of lines to copy from. Either that or find someone who has dimensioned sketches of the lines. Otherwise all you can do is take various measurements and just go by eye as to what looks good.

If you're just talking about bending the two lines that go from the prop valve to the mc, the length to be used will depend on the radius of the tube bender you are using, so you can put those loops in the lines for flexiblility.