I have been trying my best to fix a missing part tree issue with the mod mentioned but I cant seem to find any issues with the .pc files of each of the configs. If anyone could help me solve this issue that would be greatly appreciated.
Ok that's weird, then maybe I do have a modified version somehow, I'll check --- Post updated --- Something in the mod is very broken and I have no idea what, but after deleting the files for suspension and engine the parts menu works, but obviously you can't drive. I can't find what exactly is going on with that. But somehow it works fine for me when I have all my other mods active, some mod must be fixing it somehow but I have no idea which one.
I tried deleting the engine & suspension files and the part tree still didn't show up. Did you delete just the jbeam files? or everything relating to the engine and suspension?
Success! I was able to get the mod to work properly. Most of the issues I found were syntax errors like missing/extra commas in the uno.jbeam file. I'll upload the fixed version here but I will definitely be spending some time to further improve this mod.