Needs that leaking oil/hydraulic fluid. Showing dirt and grime where it sticks to areas where its most likely to leak out. Most military aircraft that have been in heavy use show signs of that, and I'd think that Mechs would show similar signs of heavy use.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.