Your list looks good. I would also add a razor saw, some metal straight-edges, a smaller sanding bar or block for small jobs, and a small square or triangle. It will also be helpful to have your engine before you get too far into the build. You'll need it for laying out the firewall, mount location, throttle pushrod, etc.

For clamps, try Harbor Freight tools. The have all sorts of them. Not quite "pro quality" but good enough for model building and so cheap you can buy a variety.

Truth is, you'll always find "one more tool" that would be helpful in building so a list could get very long. With the basics and a little ingenuity you can do quite a bit though.