If I had the time, I personally would document myself building a van from start to finish. People love watching other people build/renovate things (especially when it comes to homes) and not only could you get paid doing this but you'll be building your own usable mobile home at the same time.
Here go some examples of people doing this on YouTube.
This can be done on any social media platform. Also, If you have the time, create multiple series/episodes documenting your process of installing specific things such as carpet, electrical, plumbing, insulation, etc.