3D model of a fire engine and need the structure with the tools, etc., at the back, as well as the sides

I have a 3D model of a fire engine and need the structure with the tools, etc., at the back, as well as the sides. Attached you'll find the reference images and also the Blender image, which shows another similar project that was already created for me for a different fire engine. This is just to help you understand what I need, what quality, how detailed, and what the textures should look like. The model has 150,000 triangles, which would also be my limit. I'd give you the 3D model for this project so you can incorporate the dimensions correctly. After we've agreed on a fair price, since I've done a few projects like this before, I have a price in mind and would like to know your price and how much time you'll need. There aren't many reference images, but I'd be happy to send you more once we've agreed on a price.