So, started as suggested but doors are missing. Should the interiorproxies file remain in the individual folder for the mlo or should a single combined meta work?
EDIT: Nevermind. Helps if I add it to the fxmanifest file
If some custom props are the named same, “stream” can use only one. Make sure your model / prop is not named the same as other one. If it would you have to change name of it, for example you have two copies of my_amazing_prop. Just change one to my_amazing_prop1. Make sure you changed it in ymap / ytyp.