I've actually been modding an Agetec myself over the last few weeks, so I can relate to how much effort and planning must have gone into this. Nicely done.
I might redo the art in future but it was difficult to size up the ship properly. It's a scan of the cover art from my Mega Drive copy of the game. It was difficult to get all the detail in without losing some to the crop.
Maybe a flyer scan would do the job better? Either way I'm really pleased with the final results and would definitely do another joystick modification in future now I've done my first one!