So you're directly rotating the skydome of the Room. The problem that I have when using Cubemaps with hook5 is that the hdri for the cubemap has to have a scene fitting to the scene of the room, otherwise the image depicted doesn't have the right size in correlation with the size of the room objects, so it feels either too large or too small. So it could be possible to eliminate this by using a skydome texture and changing the radius of the skydome. For the lighting of the room, would you then simply use the PNG from the HDRI and attach a hook5 pass to the texture to make it glow?
You mention different ways to create PE morphs for clothes other than blender. Might I ask what other methods there are. I have some clothes in mind that I would like to adapt to the XBody, but since I'm just starting out, which is the best way to create these morphs. If I adapt the clothes to the standard body morph of the XBody, to my understanding, that would not use the other morphs as well, does it?