Did some Texture budget and reusing research for my rooftop project a while ago and made those panels for my design document. I have looked on how much space does each texture use to fit it in the budget I got. Also look how I can properly use th grid system to plan out space on a texture sheet to not waste anything.
The last one has some ref pictures on a clean style with metal panels I want to achieve.
Basicly the idea is to blockout everything first and then create textures that I could reuse all over the level. With that system a lot assets can share the same texture space.
Did a couple of blockouts and working on the last (proper one). Will post some updates on it soon.