Any freelance carpenters on here that can help me build out a Honda CR-V?

I have a Honda CR-V from 2003 and im trying to install a bed platform and some shelving units, problem is, there's not many right angles to work with and I'm not very industrious when it comes to woodworking, im willing to pay for the schematics you create, also if you could explain it like im 5 years old that would help too lol