I need a one off technical drawing for a new product

I require a technical drawing (potentially 3D rendering to be used in initial concept art depending on cost/time) of a new product that I am looking to bring to market.

Further details of the product will be provided but esssentially this is 1 product with a draw in the top half which features a retractable base and a lower half with a lock and door. The product must also be able to be flat packed for customer to self build.

Consideration needs to be given to material and ease of assembly.

Looking for a simplistic design and minimal parts however of thinking of assembly order etc has already been completed