What parts of c mod are just the gun placement and weapon attachments (in /gamecrysis2)? I don't want to overwrite Maldo's stuff.
You can do as Scitek is doing and just paste C_Mod overtop of Maldo's mod and worst case scenario is you'll lose some of the "fixes" Maldo made to the levels; things like more efficient use of tessellation, texture misplacements, some flickering etc. If it's any consolation, I'm using Maldo's mod but I'm not using his Level changes as I found some of the changes not to my liking. For example, the beginning of "Semper Fi or Die" almost all the trees are missing using his modded levels. It's apparently a glitch as he never intended the trees to be missing.
The issue with Crysis 2 is that most of the modding is being done using flowgraphs and the modders are repacking the levels with their changes (basically the changes are kinda baked into the levels themselves). This means that each mod can potentially nullify another (or parts of another) and is why most of the modders like Maldo, Blackfire and ShonE have to communicate with eachother; they need to incorporate eachothers mods so they'll co-operate.
By contrast, most of the original Crysis mods were made as shader tweaks and as long as the .pak files were placed in the "game" folder, they pretty much all worked together (minus TOD mods of course).