1-how do you make a terrain bigger? I've tried making it big during its creation but its always the same size in gamestudio.Should i shrink the models or is there a way to enlarge the terrain with code?
2-How do you make sky cubes? Is there a program or something?Can you make them with MED or WED?
For your first question i dont know the answer. For me it works perfect.
Second question: You can make Skycubes with any free 3D-programm. You can use blender as well.
Just make a cube. You can use any texture you want. Then place the rendercamera in the middle. Set the angle of view to 90 degrees and render each side of the cube. The camera must rotate at 90 degrees.
If you have all images than just set it in one large image like the skycubes that ship with gs. I think in this order.