You should be more specific, but I think you mean a upgraded engine, carbon fiber hood and a two tone paint, if so then I am pretty sure those are already planned.
1. Don't ask that. 2. No he can't, as he has said that he will only give a file when it is completed.
The reason for him not posting, I think, is either because he is busy, or he is working very hard on it and won't give any sneak peeks.