Extrusion Modelling

I tried the extrusion modelling exercise which is a exercise to model a riffle that we gt a 2D design for, we have to use extrusion tool to make the 2D design of the riffle 3D. To produce this riffle i used functions and tools such extrude and bevel.

shown below is the 2D design

shown below is the model I made out of the 2d design.