I'm making a skin for the XRG, I've put a perfectly level line, but loading it into CMX shows the line as being tilted slightly counter-clockwise.

if you're using a template, export your skin with wireframe layer on to see how it wraps around the car

Quote from johneysvk :

if you're using a template, export your skin with wireframe layer on to see how it wraps around the car

I don't understand what I'm supposed to be looking at. Do I just need to eyeball it and rotate the entire skin until it's level with the car?

Ye, kinda that. Skinning in LFS is complicated at first, as the templates are taken from a Beamer/Projector (Which I'd like to be a 1:1 template with the car, no stretching no nothing) and they aren't 1:1 with the car, so there will be different areas where they will mismatch if you are trying to make a line across the car for example, or logos.
Wirekits also can help to see where the skinned part is and correct it on the skin. HQ WireKits:
https://www.lfs.net/forum/thread/68788-High-Quality-Wire-Kits (they are 4096x4096, but you can resize them, or use the wireframe that already comes with the Skin Kits).
Mind that this needs time to get it right, so expect to have some patience getting used.
I might be wrong, but I read somewhere that you can add 1024 iirc to the skin's width to compensate it, but don't take my word in this one, but feel free to try it.

This explain the stretching I'm talking about:
https://www.lfs.net/forum/thread/64975-The-Stretching-of-Skins

I made an XFG skin before this with similar lines and didn't have this problem. Thanks for the help

Quote from Ibtasim6781 :

Ye, kinda that. Skinning in LFS is complicated at first, as the templates are taken from a Beamer/Projector (Which I'd like to be a 1:1 template with the car, no stretching no nothing) and they aren't 1:1 with the car, so there will be different areas where they will mismatch if you are trying to make a line across the car for example, or logos.
Wirekits also can help to see where the skinned part is and correct it on the skin. HQ WireKits:
https://www.lfs.net/forum/thread/68788-High-Quality-Wire-Kits (they are 4096x4096, but you can resize them, or use the wireframe that already comes with the Skin Kits).
Mind that this needs time to get it right, so expect to have some patience getting used.
I might be wrong, but I read somewhere that you can add 1024 iirc to the skin's width to compensate it, but don't take my word in this one, but feel free to try it.

This explain the stretching I'm talking about:
https://www.lfs.net/forum/thread/64975-The-Stretching-of-Skins

stretching the entire skin isn't a good idea, because the stretching is different for each car (and individual parts), i just use the guides above ^