I is allready a skydome made with blender. The dome covers the skybox and not the playable area and consits of two parts. The upper part has a material with "$translucent" "1" on it, so the sun sprite is still visible. The lower part has a material with "$alphatest" "1. This avoids z-fighting with the reflecting water-square of the skybox which is a fake water (refract shader). U may ask, what the heck, a skydome should cover the playable area. True. But with my solution I can let a plane fly in the skybox that disapears in the clouds. Thats cool. Your 2nd remark: I have carefully planed the layout on paper, over and over again. At one greybox-point I have started to texture it. Was it a good idea? It pushes my creativity to a higher level and now the layout is done. Risk: High. Cause if playtesting now shows weaknesses a lot of more work has to be done.