I see where you're coming from. But I can assure you, this is absolutely not going to be cancelled. It's just been a while since there's been any progress updates because people on the team have a life, yk? But, I had a conversation with JΛVI, and a new interior should be in the works sometime during next month. As for engines, Kueso is still working on them. Last update from him was that he's just got to JBeam the V8 engine variants. It'd be straight up abysmal to cancel this mod, after working on it for over a year. Way too far along to be cancelled. So yeah, it's definitely still in development.
I've changed the post title to say "On Hold". I'm saying this now, loud and clear, THIS IS NOT GOING TO BE CANCELLED. There should be progress sometime during November.