I would say get the panels first before you do any cutting.If the bottom of the weather striping lip is still on the floor by the bottom of the door ,you could just get the floor panels.Your rust holes are small enuff to just use pieces to patch,rather than buying an actuall patch panel.If the lip is gone on the floor for the door weatherstriping ,you will need new outer rockers.You can look thru my pics ,I have one pic with all the patch panels in the shot so you can see the approx size of them.I think the floor panels are about 27 bucks and the rockers were 40 buck a piece ,inner rockers were 10 bucks a piece and the cowel panels were like 10 buck a shot.LMC truck is a good source for parts and they have a free catalog.