About enlarging the tracks of a differential pair without changing the stackup

[robertferanec]

don't forget, often you would like to have the single ended impedance of the signals in diff pair around 50 ohms. that will specify the width and based on the width you then calculate space for your diff pair impedance.

the only way to adjust these is to play with stackup, specifically distance from reference plane.

I have some stackup examples, feel free to reuse them: https://fedevel.com/blog/download-pc...-your-projects

[qdrives]

Here in the Netherlands we have a company (https://www.deltaproto.com/) that specializes in proto types. In fact, they do not want to do high quantities.
I do not know if what you need is beyond their capabilities.