Don't underestimate the effort that it takes to build. It seems easy until you start looking at logistics, tooling (not just bought tools, but jigs and fixtures, too), material sourcing, the physical building, applying finishes, the redoes, wiring, plumbing, HVAC, and the head scratching when you find out what you had in your mind's eye doesn't quite work out in the real world.
The model is a good start, but even in 2D/3D there is plenty there that is not to scale; lots of little details and parts, and you will need to 'touch' every one of them in multiple ways before you are through.
I'm not trying to discourage you at all, but the reality of it all should at least be considered before any serious commitment is made.
Have you seen
Terry's garageable standy build?