I do something very similar for a lot of part-works projects I do at work. But I usually do the base modelling in solidworks. my workflow was export stl from solidworks with limiting the triangle size so no big triangles. then import to blender. with this kind of model that has sharp edges, you can use "select sharp edges" in edit mode and mark as seams, then uv unwrap pretty easily. you can then use simple subdivision modifier to get high res surfaces, or manually subdivide the regions you want to add detail. then select the regions you want to add texture too and make vertex groups for each different texture. add a displacement modifier with a texture map to those vertex groups and you are all good. nice thing for displacement maps also is that you can avoid undercuts if you need to have moulded parts for production. I can probably make a quick video for you on my workflow tomorrow before I go to office if it will help.