Australian RPEQ - Structural Analysis of Ute Tray Components

Hi guys, I am looking to hire an Australian Mechanical Engineer to verify & sign off on a few designs I have for aluminium ute trays. Cad drawings are mostly designed, this will be shared for the variations & id like to know what changes will needed to be made. I am happy to work off a fixed priced or hourly, id just like to know rates prior. The variants consist of the following: - Aluminium tube ladder rack which is a bolt into floor design - Aluminium tube ladder rack which is a "Quick release" design - Aluminium tube ladder rack which is a bolt into the side design - Gal SHS ladder rack which is a bolt into floor design - Gal SHS tube ladder rack which is a "Quick release" design - Gal SHS tube ladder rack which is a bolt into the side design - Aluminium ute tray (This may only need the mounting system/Frame signed off as variations in length will change. I have not needed to engage an engineer before so I will need the right process laid out for me. Thank you, Jarrod.