Skybox problems: make islands have ZERO margin? Ok, I no doubt did this incorrectly but I manually arranged my unwrapped UVs (after Smart project) onto my linear laid out skybox image - on the whole I need some pointers as to whether Im doing this right, but what I did was per Cycles - Skybox using 6 projected images (im in cycles)-

I unwrapped my image onto a cube and subdivided into a sphere:



And just made it huge. My issue is, packing islands gets me this:



And I have an issue with the margins between the islands, which creates these seams clearly:



Whats the best route to optimize this skybox here/get rid of the margins neatly?
I like to create skybox with uv sphere, it's simpler and easier.
Do a quick search on youtube on how to create skybox in the blender that you learn in 5 min.

It will look good like this: