The modeling looks great. 

Texturing: You can get absolute precision with texture maps and, as a rule, texture maps render faster if appropriately scaled. However, Carrara does have an excellent procedural shading capability. So, blending two texture maps or a texture map an a procedural map with something like Digital Carvers Guild Anything Goos is also an excellent option. For the wooden portions, a texture map might be the best choice but I'd try the wood procedurals first before investing the time in a texture map. For the metal, blended procedurals are the best route to take - in my opinion...   :D