Having worked in the industry for many years I can assure you that such a machine exists. Insert wood into one end and out comes a house kit on the other end, floors, walls, and trusses, ready to load on a truck. The installation that i'm thinking about was many millions of dollars by the time it was done.
The software is custom, there is no off-the-shelf software that would run a system like this. Mostly a combination of PLCs and PCs, several computers to run it. I was talking to the software developer on this project and he said it was about 600,000 lines of code to run it. The machine would automatically configure to build different size components.
You are looking to take on a big project. I suggest you look at other machines and that will give you a pretty good idea of what components and materials are needed. Hint: Magnetic linear encoders work well in an application like this.
Working in AutoCad 3D is difficult at best. Take a look at Fusion 360, the hobby version is free. A bit of a learning curve, but much easier to work in for machine design.
Best of luck to you.