Check the instructions again Karl - the seat just doesn't look right up there. I had a look at some interior shots, and compared against my Italeri kit (ex-Hawk/Lindbergh kit I think). My kit is basic, with very little internal detail, especially around the seat and frame work, but it'll end up being a lot lower than that, on scratch-built mounts and frame work.
It's almost as if there's some parts missing, for the seat mounts, which I think should be inside that open 'U' shaped sill surrounding the cockpit.