I worked on it like a year+ ago and it did work, now it doesn't show up as a mod. I placed it in mods folder packed to archive as documented in the wiki. I guess there was an update that changed how something works in jbeam files..? I'm attaching the archive, thanks for help! https://ufile.io/nkct8yyx
Like, it wouldn't show up in the vehicle selector, or it wouldn't spawn in? I extracted it from the .rar file and sent it to a .zip file, changing nothing else and it spawned in fine.