pic request SFBD on OBS

I have a 1991 gmc sierra reg cab short bed. I need some pics of cutting the frame at the firewall. I have the 2x4 steel to do it with, I just need some pics of where to cut.
 
I also need to see how everyone modified the gas tank mounting locations so I can leave it in the stock location.

check out fullsizechevy.com there is a sticky on there just search stoorfloor body drop on the site and you should find it. there are lots of pics too

check the I F customs website in the project pics