Make Changes to my SolidWorks File - SS - Thickness and Length

Hi, I need to make the following changes to a SolidWorks files: Section G-G: Distance from nose to ground and tail to ground - change from 4.5" to 2.0" Section A-A: Decrease concave & increase thickness - from 1.5" to 2.0" Thickness at Edges - 1.0" that flows to 2.0" in the center - Please verify Decreas depth of concave on tail & nose - Section E-E - Make less concave. What is the current depth? Remove center curve in edge-center view. The rail of the board should be flat along the middle of the board (Drawing View 3). Should be a fairly easy project. Thanks!