possible shape

 From:  xrok1
i've had this video game controller that i designed for a while now, and i have never been able to produce an accurate model of it. since i discovered MOI my hopes have been restored but, upon numerous attempts i find myself failing to come up with a way to achieve what i want. as you can see, i've roughed out the shape of the grips, but can't progress past this point. i need a way to edit the (four surfaced) shapes that the grips are formed with. is this possible to make?