NPCs and certain props using the HL models in the models/echoes dir where the standard Sven Co-op models will do, so this is adding unnecessary bloat to the mappack.
This needs to be changed at bsp level very every single map: for instance, every scientist "monster_scientist" needs to have the key "model" "models/echoes/scientist.mdl" deleted entirely- this will cause that entity to revert to svencoop root dir for the scientist model. Same goes for any npc, although few exceptions may have to be made, for example the HEV Suit Barney.
The maps also use low definition player weapon models and world weapon models which is undesirable and also adds bloat- the global models files needs all the the p_ and w_ references removed. SC weapons with Echoes arms already were made but was never added to this mappack, unsure as to why.