@splitshockvirus @dcc @eric custom hud elements can be done through sourcemod plugins, it's a pretty old thing too cuz i've seen all those round end plugins for cs that put a cool png over the screen for terrs or ct's
the only thing adding mods to the server will do is if there are script mods it will apply to all players and if there are models with different hitboxes, then it will actually apply the hitboxes to the playermodel, my friend uses a small rat playermodel over nick and it's installed serverside so the hitboxes are actually accurate and you can easily shoot over him, besides that there's no way to sync addons between clients without them doing it manually