Well this past sunday evening I finally had enough and I got around to designing and cutting out a mobile base for my ts3650. I've been wanting to do this for some time and when I had some recent car repairs to do and had to move the saw I realized I needed to get this done.
I built it so that the cast iron top sits right on the top of the router cabinet with the saw cabinet sitting flat on the lower cabinet. This is now the flatest the top of the saw has ever been To keep it from sagging in the front I used a piece of 3" x 4" steel tubing I had laying around that I was saving for this.
I reused the connection for the dust collection from the old setup to make it easier to attach the 90.
And this is how I enclosed under the saw for dust collection. Just remove 9 screws and it comes out to access the underside of the saw.
I still need to figure out how I want to do the dust collection for the router under in the cabinet and exactly how I want to store my saw and router related items.