WaterJet Propulsion

I need to make this design fit the specifications of the Waterjet propulsion system for a surfboard. Post that I'm going to make a CFD simulation, using Solidworks Fluid Simulation. Please help. I want to fit this Waterjet Propulsion System design into the already premade Surfboard. Just need some few changes and remove a couple of features that I will later require. You can make changes to surfboard to make it fit as functional as possible.