I saw your setup earlier overanalyse, for a mobile setup that's perfect. I like the idea of the t-tracks for clamping.
Kevin, I am going to sink the saw but wanted to make sure that the UG were not a quicker and / or better option before proceeding. I'm actually going to attach a pair of crown extensions to increase the immediate surface area of the saw and utilise the bench with a sliding fence and stop - I'm just going to use a larger version of the same alloy extrusion as I can order it to exact length and it works out cheaper (kind of).
Thanks all for the input on this one. I'll update my original thread on the build when the other parts arrive (scheduled for Friday).