not Sure of your build costs over there but over here something similar size could be built in traditional construction for less if you managed it yourself and would hold/appreciate value more? Do you have services (water/gas/electrics/sewer) on site presently?
The property has city water and sewer hookups. The biggest influence of getting a Clayton singlewide mobile home is essentially pricing and the housing market. Simply put, owning a home is no longer a great investment as it used to be and the majority of people are underwater with their homes in addition to needing major repairs. Houses are at this point a waste of money unless you make a full cash purchase. Rent is skyrocketing along with required fees.
While I can afford and got approved for a 200k home, I simply would have been working myself to death and my quality of life would have been severely diminished. A mobile home is less expensive because its a organized and consistent design built in a controlled environment that is not affected by weather. Its also a very bland product and while I'm able to pick a few custom options like the color of my carpet, you don't get a choice in the setup or design.
The thing that matters to me is to not only own a quality home but to not diminish my quality of life. Spending 56k for a singlewide mobile home allows me to get a high quality product and not bust the cash register.....and since I own the land, its going to allow me to put even more money away.