Ancient Yamaha classical guitar

[heiya]

Hi all,

I've got a question about a very old Yamaha classical guitar G-225. I believe it's from the late 70s?

I know next to nothing about classical guitars so I'm hoping I could get some help here.
1. Should the saddle/nut be glued down?
2. Should I be worrying about intonation, as this model does no come with a truss rod?
3. And of course, any idea how much it might be worth? It's pretty beat up and both the original saddle and bridge are glued down, the original nut is cracked at the corner.
4. Can the action be altered?

Thanks in advance for the help guys!

Edit: forget about qn3, just saw a thread of someone giving it away LOL!

 

[TravisK]

This guitar is not worth any saving.
The money spent is equal to getting a new one of the same range.

Save it if it's sentimental.