Does anyone have better directions/photos on how to do the a/c box to non a/c heater box

[6spdg37s]

I am trying to follow the directions that came with the part from gbodyparts.com but the instructions are terrible. I am up to the part where u need to cut the old part to attach it to the new part (step 11-13) does anyone have some better pics of when they did this ? it would really be appreciated ! I obviously don't want to cut it in the wrong spot then im screwed !

thanks !

 

[6spdg37s]

okay so I think I figured most of this out... its definitely screwy I think the key is to not take off too much at once kind of shape it slowly towards what they want the end result to be in the directions