btw, you don't need to use that black plane from that package. You can also make the background black by changing the color at "File -> Preferences -> Colors -> Preview - Background". Here is a screenshot of it.
While we're on the subject, here is a tutorial for beginners how to create wireframes:
When you select a model, you can open it in the cutscene editor - that's where you position your unit and take screenshots to create your wireframes.
The cutscene editor uses the lighting of the current texture set you're using on your map. Change the map's lighting and the cuteness editor's lighting will also change. I recommend creating a copy of the Default Light entry. Then, toy around with the settings of the currently-used lighting, and set your unit's team color to white. Remember, the wireframe must show the green/yellow/red colors clearly, so focus on having a light that makes the unit colors bright, so that it looks as white as possible when making the wireframe greyscale. Study existing wireframes made by Blizzard to understand the importance of readability.
Select the unit in the cutscene editor to create a white outline, and you should be good to go to create some wireframes of your own.
The problem is that I need a file called Assets.txt, there are several of them, in the different Blizzard mod, but there is one in particular that I can not find. With this you make the UED race have its own buttons and interface, without having to replace it with another race.
Strange, your mod's own Assets.txt file should override all the others, so adding your UED textures there should work. I can't imagine that a relevant texture wouldn't be listed in the core.sc2mod file either.
Anyway, here are all of the files from all mods I could find: Assets Textfiles. Hopefully you can find what you need there.