Thanks for checking Michael,

As for slight overlaps i did notice on the nose/tip of mesh that there is 2 surfaces overlapping each other slightly although i have no idea how is that even possible 'coz what i did is i made plane in center of X axis and i Boolean everything and then deleted one half and then mirrored good half. So i should have exact join in the middle and nothing should be problematic, maybe mirror tool have some tolerance/decimal point error and made that small overlap somehow?

Is there maybe tool something like "Set Value" tool in LightWave where i could select all edges on half of split model and set them to 0.000 in X axis so that i'm sure that prior to mirroroing there is no surfaces that are "shorter" or "longer" so then mirroring must be perfect in the middle ?