You might want to check out FLAG, which will let you download fic from a number of different sites, including Skyehawke, in a variety of different formats, including HTML. You may need to do a bit of cleanup, especially in the "style" section, which imposes wide margins and a blue background... but that's about 20 lines of code that can safely be deleted in about 30 seconds. (Seriously, just whack everything between <style type="text-css"> and </style> and you're golden.)

eta: forgot to mention that it will automatically download all of the chapters of a multi-part story for you and put them into a single output file.