Get my car working again! (after i took it apart)

I took it apart to do put a much bigger turbo on it to take it from 300 to 450bhp, but after i didn’t quite get it finished then i was made redundant i decided to put it back to how it was before and sell some bits until i could afford it in a years time.

I’ve put it all back how it was but it will not start now and i don’t know why =(