Does anyone have tips on dash reassembly for a bare dash going into a 68 B Body?

I had the dash sandblasted and painted and am going back with all green stuff like original.

Is the dash pad the last to go on or does the switch panel go in last?

Any tips on screw sizes? I know you can buy a kit but it would be easier if I could go to the store and get particular sizes rather than dig through my hardware stash.

My car was in pieces when I got it and I am putting in a nice dash I got as opposed to the one I got with the car that was hacked up for speakers and stereo.

Thanks for any advice.

Tim