A lot of people run into issues when trying to install basic Blender modding plugins, especially Sollumz. Because of that, I made a simple step by step tutorial showing how to install it properly.
I have also started a full MLO creation series that will go from start to finish.
Part 1 currently covers:
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Exporting the building
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Creating the shell
Watch here:
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Sollumz Installation Tutorial: https://www.youtube.com/watch?v=zv3NdateGqs
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MLO Creation (Part 1): https://www.youtube.com/watch?v=mNUfxcEHDic&t=76s
More parts will cover things like room IDs, YTYP creation, collisions and texturing.
If you get stuck or have any questions, feel free to reply and I will help.