Revisiting this idea, though I used a sketch from April last year to finish this. I also used Blender for the background, to practice. To save myself time I used a lot of pre-made assets from the creative commons, and it saved a hell of a lot of time.
On the plus side, my original sketches for the background were close to the right amount of fish-eye, so it blends together really well. In some places less so, but I wasn't really expecting to get it right, fish-eye is hard.