Nice. Is your stand level & solid? I would plywood the back with 3/4" ply to keep it rigid. Run the ply 4" up above the table & cap it off with a strip of hardwood. You can mount everything to the ply wood solidly.
The issue is that every saw is going to have different measurements so its hard to give you an exact plan for your saw. If you look in the instructions for the KMS8000, on the last page in the bottom left corner there is a sample plan of what you want your wing to look like. This plan is designed based on the saw just sitting on top of a table. You will need to make sure that this vertical piece is perpendicular to the work surface to make sure you will get accurate cuts.
However, it appears from your picture that your saw will be recessed into the table which will negate the need for the bottom support as long as the top of your table sides are flush with the base of your saw. Basically all you need is a vertical piece that is 2 1/4" above your table surface if it is flush with the saw. This allows you the space you need to attach your top trak and have your stops work properly.
Hopefully this will clear this up. If you have any other questions please feel free to ask.
You can either fasten the fence section from the bottom or if you want you can make an L shaped piece so that you can screw that directly to the table top from above. I know its not the easiest to screw from the bottom up into a vertical piece and not have the screw move some on you.
Yes, you can cut down any of the pieces of the trak since it is made from aluminum. You can use a bandsaw or chopsaw that has a metal cutting blade or you can use a simple hacksaw as long as you make the cut square. Sand down the edges so its not sharp and you are good to go.
Hi Luke. To cap it off I just meant to glue on a strip of hardwood to cover the plywood edge is all. I can't wait to see what you end up with.
PS-- That's way better than what I have. My saw sets on an old rolling tool cart my FIL gave me. I use Harbor Freight roller stands for supports on longer stock. I have no room for what you've built.