This reminds of a good friend. He got a job making six figures at Google straight out of college, and then lived in his van--in the Google parking lot--while saving every penny he earned. He took showers on campus and only ate free Google food. After a few years, he went into a mini-retirement and devoted his time to traveling around the world and volunteering.
I would have loved to save money right out of school, being as frugal as I am, but I was married when I graduated and the first thing my wife wanted after I got my first (low paying) full time job? A house.
Putting money into a house you'll presumably be able to live in rent-free once it's paid off may not be a drastically worse choice than putting your money into savings. Unless it was an impractically huge house, or otherwise somehow not a keeper, I wouldn't consider that a frivolous/non-frugal purchase.
I lived in the van Monday-Thursday while working in London (my home is around 130miles to the east). Not a problem and not uncomfortable. I sometimes used the showers at the office but my van is fully equipped with shower,toilet heaters etc. I wasn't the only one doing it either, and after a while you spot other likely vans.
