Ditto what E. Pluribus Unum said.
This is still a free country for a little while so go ahead and fix it up however it pleases you. But don’t be surprised if you put it all back together original someday. Scopes and big magazines will work OK if you are willing to tinker with them a little. - Usually at a cost of the ruggedness and quick field serviceability that was designed into the little rifle.
About the only mod that worked well enough for me to keep is a Williams rear peep sight. A lot of the front sights on the SKS need the post aligned out of center with the sight hood to get the rounds on target. Replacing the commie u-notch rear sight with a windage adjustable rear sight lets you center up the original front sight. This really helps accuracy, especially on moving targets. No, you won’t be able to show up the guys with $$$$ M1As and AR15s. But instead of hitting your occasional milk jug at 100 yards, you will be hitting Pepsi cans more often than not.
Even though the bogus “assault weapon ban” has expired, a lesser known infringement called “section 922R” remains in force. You will need someone above my pay grade to explain all the nooks of this “gotcha” regulation. It regulates how the free citizen may modify his firearm with big brother's approval. I don't know where you are from and it may not be a good idea to post it, but ask around locally...Then get a couple more opinions.
I don’t expect it to be much more than what it is good for- a 100 yard service rifle.
I was thinking of the Williams rear site for the reason you stated. I’ve owned this own for 20 years and don’t plan on
adding a scope.I’ve just never seen the point of one.