Thanks guys.
Here's the result of many many hours using Hugin and Luminance HDR (sometimes Hugin just brain-farts and doesn't make a usable image, then run it again and it's fine).
DPP-processed raw files as monochrome (red filter), 1/1 NR and everything else defaults.
Then jam them all into Hugin, mask out the flying seagull in 2 of the shots, add 273 of my own control points (4 per overlap or near enough). Creating .EXR didn't exactly work, so I changed to .TIFF (which created a lovely 1.1GB file, thank god for 30GB of SSD-swap-space).
Then open in Luminance, and tonemap about 50 different ways until i find one i like. (then forget where I saved it).
I gotta find a quicker way...
Click image for larger version. 

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