Exactly. While you lack the tools needed to create the custom parts, you may possess the assembly skills needed. So lets say you like my 182 button box. I could make the maker parts; then you could buy the off the shelf parts and assemble it.
Or you may have a vision for a part in your mind but can’t seem to get it right in Fusion360. You could do a rough drawing and someone could draw it up. Here’s the drawing for the 182 faceplate. I made it with LighBurn and will import it into Fusion360 to make the STL and CNC files for it. See my other post Here for pics of my original prototype that I am just finishing up completing the build on.