Hi everyone, first time posting.

I recently took the plunge and decided I'd give building a guitar a try. I played guitar back in school but in all honesty, it's been a little while since I picked one up, but I wanted to do something that I could enjoy doing (working with some wood & to a plan) and being able to enjoy the finished product at the end. Added bonus if my daughter decides it's interesting enough, she might even play it, too. (She's already keen and excited to see the guitar get painted in the colour we picked out - even to the point of asking me a number of times this weekend "When are we going to paint the guitar, Daddy?")

I figured the best way to get into this was to go with the JB-4 kit and see how we went from there. It arrived last week, and I eagerly opened the box in the garage and took all the bits and pieces out to check that they were all there, and to do a dry fitting of the neck to the body. It's tight, but it fits! (1st win!)
After packing the box back up, I read and re-read the instructions - particularly about fitting the bridge, and I think I have a couple of questions:
1) The instructions mention lining up the centreline of the body with the middle of the bridge. I worked out the middle of the bridge pretty simply, but the centreline got me stumped for a while. Am I right in thinking that with the neck fitted, I can run a straight edge down each side of the neck to the end of the body, measure the half-way mark between these lines at a couple of points along the lines and that's the centreline? Is there a better way to work out where the centreline is? In the end, the method I used to work it out seemed about right, so I went with that.

2) To measure the scale length, do I need to adjust the saddles on the bridge to be at a certain point before securing it where it's meant to go? If you look hard enough at the below photo, you can probably see that I've wound the saddles back in towards the tail(?) of the bridge.

https://imgur.com/HYevhGa
(I've linked the image as opposed to putting it in-line because holy table breakage, Batman! I'm hoping this works. Please let me know if you cannot see it.)

3) The instructions talk about stringing up the Highest and Lowest strings and checking for clearance on the frets. Unless I'm missing something, by the looks of things, I'm going to have to fit the tuners (using the screws for them) now and string them in - does that sound about right?

I'm excited to do this project! At the same time, I'm nervous that even though I have the plans, instructions and resources, I'll manage to muck it up somehow!