This Mission If dont use skin is not Funny so Install the skin first
Open your GTA3.img in c:/Program Files/Rockstar Games/GTA San Andreas/Models/GTA3.img
Search a Following files

bmyri.dff and txd 
bmost.dff and txd
cwmyhb1.dff and txd
cwmyhb2.dff and txd
heck1.dff and txd
heck2.dff and txd
wmoice.dff and txd

And replace it with this file

And weapons search in GTa3.img

chnsaw.dff and txd
knifecur.dff and txd 

and replace with this file

Maps 

Open Your GTA Root Files Open Data , Maps , Country 

And drag Countryfile and replace it

Note : This skin , wapon and maps not created by me 

Thanks to 

Zeb89 and automan
Kal-el5676
PatrickW And Dutchy3010
And you foy downloading my mission

Happy Hunt