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 - i can't provide you a cost and time frame estimate based only on the description here...
2 - if you want to share at least some drawings/sketches with minimum of dimensions/positions, etc we will be able to have a technical/engineering discussion...
3 - what kind of suspension do you need/want?
4 - what kind of vehicle is? recreational, off road, kart, concept, baja...
5 - except for the ots components, which are your manufacturing capabilities? (being a custom made suspension will have some specific components/parts which will have to be manufactured)
6 - which are the general lines for the chassis? do you have the drawings/sketches/dimensions?
7 - the chassis will be covered, or the vehicle is naked type?
8 - what about the bottom plate?
etc, etc, etc...
Regards
Bogdan