2) If I add an image scope on the top mount it works as artificial vision so when the elfs looking through a pair of glasses/goggles they can see things clearly till they activate the smartlink they wouldn't see anything because the imagelink doesn't have low light capability.
An image link is just a conveyance of visual data from a source to a screen. This "screen" might be your eyeball, or it might be part of a scope. Therefore, your image link is going to see what the camera sees. For the purposes of the rules as written, smartguns work in all visual conditions.
3) To benefit from the smartlink system I also need an imagelink system as its an upgrade to that and wont work without the base program.
Yes, but all cybereyes and most visual enhancements come with image links already. If they don't, it's super cheap to install them. Since this is probably part of your mage/face design you're working on, I'd consider contacts with smartlink, image link, and flare compensation to be my day-to-day wear. You can then put goggles, a monocle, glasses, or a sight in front of the contacts and stack the benefits (to an extent).
4) Since I'm using a Fichetti Security 600 the bottom/top mounts already taken up by the inherent laser sight leaving me 1 mount available.
Correct.
5) As I have only 1 mount and need an imagelink to benefit from the smartlink I need to buy the imaging scope with an imagelink as well (plus internal/external smartlink and same on the goggles).
Image link only needs to be in your vision enhancement of choice (cyber eye, contacts, goggles, glasses, monocole, imaging scope). The gun does not need an image link. If you buy an imaging scope for the gun (which seems like overkill for a pistol) then your image link can be displayed on the imaging scope instead.
So I will end up with a Fichetti Security 600 with a lasercope on the bottom mount and a imaging scope on the top one with vision magnifcation, imagelink and smartlink taking up 2 capacity leaving me 1 to take as flare compensation, lowlight or thermographic vision in my last capacity upgrade?
You could do this, but then you only get those vision enhancements with that one gun and only while using the imaging scope. I'd recommend using the contacts I described above.