Your project may seem like a mountain right now, let's climb it together.
3D Design
I spent half my career designing products and the other half designing the tools and equipment to make them. I'm most comfortable in Solidworks but have experience in most major CAD programs.
Plastic Part Design
There are many out there who are capable of creating complex plastic parts / assemblies. However, plastics have specific rules. If you start the product development process with a design not suitable to be molded, you will run into costly re-design down the road. I spent my entire career learning the rules that need to be followed and even more importantly when you can break them.
Tooling & Molding Design
Although most of tool/mold design is based off of sound engineering principles, a great deal can be influenced on the team's experience, capabilities, and past failures/success. Whether its coming up with tooling concepts, evaluating existing designs, or coming up with complete mold designs I speak the "language" fluently.
Design for Mafacturing
Its great to start out with a part that's 100% ready to be made and mass produced. Unfortunately that's usually not the case. Most manufacturing companies can't do the design work or won't do the design work for liability reasons. When companies don't have internal/external design teams that understand the MFG process involved, the DFM stage can be very time consuming and sour the relationship.
Supplier Evaluation / Audit
After dealing with hundreds of suppliers/manufacturers I've learned that even though they may be "certified" it doesn't mean they are "qualified" to make your product. Most companies don't find out they weren't a good fit to after a lot of time and money is spent. At that point its too late.
Industry Specific Validation
Whether its an automotive PPAP or a medical DQ, IQ, OQ, PQ few people of designed the parts, made the protocols, made the part, measured/validate the part, and completed the required documentation.
Simulation - Flow Analysis
A simulation is only as accurate as the information you put into it. If you never designed a part, the simulation will be inaccurate. If you have little understanding of the machinery that will be used, the simulation will be inaccurate. If you have no idea how a facility will process a part, the simulation will be inaccurate. Even if you understand all that will be involved in a part, there still will be parts of a simulation that will/can be inaccurate. Navigating the science /math / and reality can save time and money.