Building your own console is like making sausage. Like people here said, few survive it, and that's not a joke. It is emotionally and mentally taxing. Older consoles are also a close second, as in those days, studios had maintenance staff, who were really good at fixing everything. Many of the old console will have switch and pot issues, and many are custom values, and are made of unobtanium. Many of the new consoles are almost unrepairable for most people.
I don't want to ad here, but you should check out a FIX console, it has a lot of great features and it can sound like any console you prefer, up to 3 different ones at once. No audio runs through switches, all through relays, Pots and switches are paralleled redundant wafers and available on Mouser or Digikey, the inputs and outputs are all diode protected, and the bus structure has the opamps and transformers of your 3 favorite consoles, so you can switch tones between A, B or C stereo bus as you mix. I designed it that way because I don't want to repair them, and I don't want you to either...
Plus you can start with 8 channels and add to it whenever. Every frame layout is to your liking (to match the profile of something you already have, etc.) and you get extra side pieces so you can grow it in the future with little effort. The studio in Australia has an 8 channel one and he said that it's his best friend...
We have done traditional looking consoles that lay low, and raked ones that look like the old Neves, Spheres, EMIs etc. Plus, I make stereo consoles and Immersive consoles that pan to 9.2+6...
