I have my degree in the computer animation, and have been working for the past 5 years design in 3D models for Patent designs. I viewed your sample links in the PDF, and I'm more than confident that I can deliver equal or better quality. delivery will be 4K, and all source files will be delivered at the end. I would love to go over details of your project, including the design of the septic tank.
I would first model everything and then get you still images to view. and if there are any revisions we can take the care of that before animating. after that a low resolution render will be delivered to go over and possibly make revisions. once that is approved, the 4K resolution will be rendered.
please let me know if you have any questions, or if you would like to go over anyting.