It looks a ton better and much easier to read now too. Good changes.
I think the Legend box is a bit strong and overrides the actual map. If you have it on a separate layer you might try lowering the opacity on the box as I think that would allow you to see through it more. (If you want it to look like a big chunk of slate sitting on the map then I think you are fine.)
If you downloaded the .scm file and moved it to the correct directory in your gimp folders. It should tell you in the readme instructions but if not you want the /script folder. Anyway, in Gimp go to 'Filters>Render>Map Scale Legend' this will pop up a window for your variables. I had to experiment with them for a bit before I understood how it worked but it creates a little scale that you can then cut/paste and drop onto your map.
So maybe no slaves, just expand the Engine room and put one of yer elephants on a big wheel like a hamster. That should get you some power