1. is the downloadable pdf manual the most current and up to date? i would like to print it out and start going over it, but im a little hesitant
Yes.
2. could i build the whole thing and save the cowling engine for last? (im trying to put off buying my engine until later to spread out the cost)
Yes you could.
4. would it be easy to put it wing strobe lights and nav lights and a rotating beacon and landing lights?? i would really like to do this, anyone else plan on this?
Wouldn't know about that sort of thing... never seen the hardware for that sort of thing. I'd be interesting in seeing it when you do though.