Hi Brandon,
Don't take this the wrong way but your ask is too broad for a detailed reply.
What info would you provide ie; scaled hand drawings, CAD drawings, sketches or what I refer to ask talkatecture, no offense again but there are many here that could provide the gambit if we knew more about what you need and what your budget would be? Basic shop drawings for designer approval being 3D model ie an isometric w 3 views as a basic could be $500.00/per & up range, but that is shape and form to convey scale and look. Then full blown modeling with parts breakout drawings & joint construction details being dowels vs tenons would be in the $2-5K. Then there is the question of scale manufacturing are your designs to be CNC routed from plywood or back legs like you refer to being a total of 10-15 in quantity = stick built low volume bandsaw & template route /sand, or in the hundreds which your more than likely doing one-peice flow CNC jigs or templates for profilers which would be high volume production runs that more than likely need prototyping. Do you have a manufacturer identified or are you job shop sourcing?
Then you say concepts, so how many designs are you looking to have fabricated and number of each and most importantly what is your timeline? I have reverse engineered other designers 3D models for production but that was in-house for a contract furniture manufacturer where I designed to the constraints their equipment and processes. Is there upholstery, foam, cut n sew, metal ....? Who is your audience, low budget or contract grade ie corporate / hospitality high end which use more expensive materials and processes.
I am booked 6months currently, best of luck,
Tom
Member