Hi there,
This is Bogdan from Romania.
I'm a mechanical engineer - specialized in the industrial robotic field, 3D designer and modeler (from time to time and some projects I could make the functional prototype too).
I'm doing product design, industrial design, reverse engineering, ideation, etc.
I have over 15 years experience working on various systems/devices across multiple industries, from concept to launch.
1 - my bid is higher, because i know for sure what involves designing furniture - i used to have a small custom made furniture company...
2 - some of your ideas in the pdf are ok, but needs improvement (ex - for the hinge, and in order to be sturdy enough, will need a sliding stopper - otherways in time will fail...)
3 - you said 12 mm panels - it is mdf?
4 - with the files i will provide you'll be ready to build this table (in the bom list will have everything, including screws, connectors, sliders, etc)
5 - other details to be discussed in chat...
Regards
Bogdan