I’ve reassembled that gun several times and can help you. Take some pictures of how you have the gun assembled so far this way I can get a better understanding of what you need to do
Looks like you have everything in the right place.
What happens when you try to put the two halves together? Do they not sit flush? Take a picture of what it looks like when you’re trying to put the two halves together.
Just took mine apart and looking back at your pictures, it looks like your trigger is in the wrong position. Did you disassemble the trigger too? It should look like this
BTW ignore the screw in front of the trigger. Mines is the adjustable version. The main point is that the top of the trigger should be in that position