quick answer on the sky..
in your (ed42) Maps init.con
Under
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rem These settings are usually in /init/sky&sun.con
Replace the sun coordinates
e.g.
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sky.sunLightDirectionVec 0.577/0.577/-0.577
with this
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GeometryTemplate.create StandardMesh SkyBox
GeometryTemplate.file Sky_Guada_m1
Sky.initSky
Sky.addCloud
Cloud.setName cloud_0
Cloud.setSrcBlend BMSourceAlpha
Cloud.setDstBlend BMInvSourceAlpha
Cloud.setTexScale 5
Cloud.setSpeed 0.02 0.04
Cloud.setHeight 5000
Sky.changeOfsCloudHeight 2500
Sky.changeOfsCloudDist 333
sky.changeOfsSkyHeight 150
Sky.setCloudFog 0
Sky.setSun sun
sky.sunLightDirectionVec 0.851836/0.230153/-0.486727
Sky.setRotAngle 180
TextureManager.mipmaps 1
And you will have sun..
You dont need all that info above and ed42 will ignore some of it.. but as a habit.. its easiest to copy the whole section of sunlight info so you can also copy it back to your unpacked pack later.
When in ED42 press and hold 'L' to drag the sun around the sky.. line it up with the sun on the skybox

You can change the
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GeometryTemplate.file Sky_Guada_m1
to any sky you want.. just look at any existing map and swap the name.. dont worry about the coordinates because you can align it easily in ED42.