Cole;
Hi!
NICE Berge! Camo looks good and mostly your weathering and wear is spot-on, to me! I say "mostly" as actually I am in the "not silver" camp mostly - rather chip and wear edges with something more like very dark browns and dark steel, and / or a tiny edging of red-brown or similar to "reveal" a little exposed red-oxide primer around places bare steel (actually pretty dark except when freshly scraped) is exposed. So, I use black and dark umber or brown and graphite pencils for this stuff - Still - that's just a preference by me! And YOUR job looks GGOD!
Two things I would suggest: First - wooden beams... I have found that the easy and great way to get good - looking wood de-ditching beams is to use a piece of 1/4 inch square stock bass-wood. A real wood beam looks the part. That wood piece can be easily gnarled and gouged and nicked up - remembering that this beam may well have been chained to a tank-tread and driven over, or used to brace a veicle being pulled over it. It will get pretty banged-up. Also, the wood can be realistically stained with applications of very thin oil washes (or with acryl washes, or both) - darker grays, earth browns, dark browns, and dust it up with whatever dusting you may apply to the tracks of your berge. IF you are sticking with the kit plastic - you can carve and scrape on it some - keep most things in line with the beam, and not "cross-grain". Nick the edges. A bit of coarse sanding with 80 grit will get things roughed up. If you get any chance to, take a look at the wood baulks often found on haevy equipment hauler trucks. These will give you the colors (muddy grays and browns, some patches of stain, etc.) and the ambience of a chewed-on piece of wood.
And second, those pulleys. I would recommend you get dark steel or darkened gun-metal into the chain - grooves, and maybe add in a little dark brown and red brown washes there for minor rusting. This will make those pop! That, and chip the edges and make these things look pretty scuzzy - these would get banged up fast in use!
Cheers!
Bob