Superku is right, this project will undoubtedly fail. Upon hearing of your condition I must say that I pity you and wish you the best. Nonetheless, you should really consider making a game that you will be able to get into a working state before you lose your sight. A less ambitious game does not necessarily equate to a worse game overall. Some of the most famous/fun games known to the world, such as Mario, Plants vs. Zombies, and Minecraft, are built on very simple concepts and designs.
Can you have more than one sky-box each with a different sky texture?
Yes, but due to the way sky blocks work in Gamestudio you will have to manage this by script.
