I just want to make sure that you know for $550 you will probably get integrated graphics. I say this because sometimes with builds at this price point people are unhappy and then want to upgrade anyway.
19.5 cm really isn't that big at all, that it is about the size of my hands which are medium. They still might be a little big for an extreme claw grip.
An access point is basically like having a second router but they aren't as tricky as a range extender because you have to set them up in exactly the right spot. I used to have a range extender but i currently have an access point set up.
It wouldn't really, that's why I did not mention it. Just in case you were wondering, if the refresh rate is not synced with the frame rate then it can cause similar problems.