Yes that is true, but we do not know the scope of the OP's request. The OP just wanted to know if anyone had any experience with PCB manufacturing, and if there were any prototyping focused PCB manufacturers. The direct response would be yes. I also do completely understand that all of the marvelous technologies we all the time such as GPUs and CPUs and motherboards, and even some of the little SMDs require(d) many peoples efforts to bring them to life. I learned this the hard way actually. When I was a freshman in high school I wanted to see if anyone could make me a motherboard with all of the PCIe x16 slots (8 of them to be more precise). I had by then learned that more or less all the motherboard manufacturers were using the same components from the same people (ie: ASMedia, IR, Intersil, Texas Instruments). So I naively thought that making a motherboard was like making a part list in PCPartpicker and then building it, but harder. Quite quickly I figured out that the real work goes into making sure that they all work together, and then laying it out, and all the other steps required. I am no pcb designer, but I have my fair share of experience with Altium. Boy do I hate that when you click on a via close to other things, Altium will second guess you, and ask you what component you want to select. My belief, after reading the OP's question, was that either the desire was a custom motherboard, like a mini-dtx board that actually uses the extra space for more pci slots unlike the new asus x570 impact, or a custom riser/converter -- like maybe a bifurcated riser with a PLX chip, or maybe a custom psu. All of those are very complicated, whether for signal integrity puposes, or just because its a motherboard. If the OP could respond as to what they want... It would make a recommendation much easier. However, because I do not work with PCBs all that much, maybe b_force could recommend something. I do hi-speed logic design, but my work is more academic than practical, so my designs will influence cpus in 10 years maybe, and then only probably in supercomputers (For more clarification, I design "practice" half-adders for instance, but that use a different style of addition that lends itself better to quantum computing. I also work at much lower levels of abstraction, at the transistor level, becuase both of my parents had PhD's in physics, so it rubbed off, and that way we can use the layout of the transitors, and the design of the transistors, and also the node, and the quantum tunneling effect that gives TSMC sleepless nights to create a half adder that can safely operate at a much higher clock ~6 GHz, and use less energy and be much more effective. I also explore process speed gains like speculative execution, but that are much more secure)