you know, i'm poor too and have a lot of problems myself, but i'm not using my sob story (yes, cancer fucking sucks, i have a close family member who is battling it too, and fighting for child custody is extremely stressful slow progress as well) to put my mods behind a "paywall" and then act like a 8 year old kid if people call me out for it, but to each their own.
hey, good for him that he figured out how .lua scripts and high res textures work, it looks very good and all (the winter stuff looks amazing), but the way he's acting like he's some game development god and everyone else is a shitty person if they don't pay him money for his effort is really annoying. it makes me want to NOT give him money and keep his mods for himself
so basically a very low poly version of the interior will do? i'm asking because i have multiple meshes (seats, dashboard etc.) and if i combine them into one it might be over the poly limit
edit: what if you give the 2nd mesh (outward facing one) a texture with a completely transparent alpha channel? that might cause problems with the alpha transparency of the windows though, not sure