Do you see anything potentially wrong with this plan for residential new construction?

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I am building a house...

https://www.dropbox.com/s/2ta56u5d2esz6h9/house.JP...

... that will cost about $73,000 to build, mostly because I'm doing a lot of the labor myself.

Based on current market data, I think I can sell it for $140,000.

Then, I will build the same house again, but in the area around San Jose, CA because I researched home prices and saw that houses go for 5.5x more. I can build the same house for the same $73,000 and profit around $540,000 after the sale and taxes.

Do you see anything potentially wrong with this plan?