Custom Home Building.

Hope this is the right place to post. But, I was hoping to have the financing process broken down (or confirmed) a bit more for hiring a custom home builder. Location in DFW area and I will need to buy the land. From what I been reading it seem like 20-25% down will be needed for a construction loan, playing interest only until build completion. Will also need a land loan for the land. With the possibility of rolling everything into one once house is completed. Did I capture everything correctly?