Maybe you could also add the original 1.6 player models to the checksum monitoring list
cstrike/models/player/arctic/arctic.mdl
cstrike/models/player/gign/gign.mdl
cstrike/models/player/gsg9/gsg9.mdl
cstrike/models/player/guerilla/guerilla.mdl
cstrike/models/player/leet/leet.mdl
cstrike/models/player/sas/sas.mdl
cstrike/models/player/terror/terror.mdl
cstrike/models/player/urban/urban.mdl
they should have the checksum of THESE files (not the original preinstalled ones)
http://downloads.awfl.eu/regelwerk/16models.zip
e.g.:
arctic.mdl
MD5 85A5375E674423A323745E6CA348285D
SHA1 7A903E11D9A421EB5971C87F8BC96DB0038FCAE8
SHA256 C81EC2842D0391023377D451E756E2084D06DD5D4194354F84F3E75F5A673EA3
Best Regards!