Front end damage ; my car struck a tree and i wanted to know how much of the front end as fas as the bumper and anything behind the bumper can be replaced by nuts and bolts with out doing any welding or frame work ? if possible send me a pic or blueprint of your theory or diagnosis .

Yes please, post the pictures. There is usuallly a small grey logo next to the green Comment button. Click this and it should let you upload photos.
If the main body of these square tubes has significant damage your best getting a specialist bodywork repairer to look at it as this might be a chassis rail. They will easily be able to tell you how bad the damage actually is.
The impact rail in a bumper bolts to the main chassis of the vehicle. If it's damaged badly enough the worst possible case would be that the vehicle is unsafe to use and has to be junked.

Hmm weather stuck on this planet? :D

Yes the lighting likely burned out the car's electronic control module(s). Contact your insurance company, this can be a very expensive repair.

sounds like the bumper mounting plates are bent

The airbag technology uses many factors when deploying. If it doesn't see the need, they won't pop out at you possibly injuring you more than the small accident. When I was clipped on my rear corner and spun me around in the intersection, they didn't pop. But a head first hit popped them. The primary sensor is behind the front bumper

Sorry no idea iam not a bodywork man but couldnt you repair it with a tub of fibre glass ? Maybe try a scrapyard ?

Can be with different L shape brackets and some holes drilled. But keep in mind they come from factory spot welded. The frame may also need straightened.

It should be attached to the front of the lower radiator support behind the front fascia. Look for the two wire pigtail harness hanging loose if the sensor is missing or you can't find it.

The outside temperature sensor will almost always be in the very front of the car. Before anything else. If it were behind anything, the readings would be skewed by the heat of the car. Check behind the front bumper... look behind the grille and behind the air dam. Good luck.

It's pretty easy to remove the front bumper.

1. Remove the plastic "air dam" below the bumper by unscrewing and then popping out the four plastic connectors underneath, then two on the sides.
   
2. If you have fog lights, disconnect them by reaching up and behind the bumper.
3. Using an 18mm socket, remove the nuts that hold the bumper to the frame. They will be located immediately behind the tow hooks, if you have them, or the small bumps where the tow hooks would protrude.
4. Slide the bumper off.

Here's a link to a writeup for installing an aftermarket bumper, but steps 1-11 explain how to remove the factory one, and it includes pictures.