Yes you will enter on a 45 visa exempt stamp, and you can extend this once only for another 30 days for a cost of 1,900 baht at any immigration office in Thailand
If you are going to start building you can apply to have a temporary electricity meter at your land, the price is more expensive per unit used, just apply at your local PEA office, you can also apply for a temporary water meter as well.
so what do you do in 10 years time? Or in the meantime if the BOI cancel the program, which can happen if they choose too, as this visa has nothing to do with immigration, in fact immigration are totally against it, according to our neighbor who is head of immigration in Phetchaburi province. Hope it all works out for you.