Surface Tooling for SolidWorks Engine Cover

I have a project and would like to ask you for assistance. It is an assignment, in solidworks, using surface tools to create an engine cover that fits an already existing main body, it should be attached to the frame of that body. There is some requirements how to cad the cover, only using planes as reference points so every feature is independent and the model is as much modular as can be if say the engine change dimensions or some other details change. It should be done with at least 5 different surface features, and the end product should be a solid body where 2 persons should be able to stand on it, there are two penetrations for the exhaust pipe and tank, everything should be named, planes and features and be easy to follow in feature tree. If you have the opportunity I would much appreciate it. I can send pdf of assignment with all the requirements , zipfile with all parts of main body where all dimensions and design can be found to make the part, and a part file i did of the cover with the design intent using planes and penetrations etc. Best regards Carl