I didn't look into the gift card deal but if you book a certain number of nights you get a gift card with a pre-determined amount on it.
Here is what I understood from the builder. Automtically included in the price of our house is a $1000 plan change allowance. They have told us the changes we made to the floorplan aren't major. I just moved some stuff, I didn't change square footage or anything. SO, they will draw up the blue prints based on what I gave them. That step comes first.
Once we have that done, they can start building. The picking out stuff comes later. It's only a 90 day process from when they start to build.

As soon as we finalize the blue prints they can start building. And like I said, I didnt' change it TOO much, just turned somethings. And we saved money because when I moved stuff, I actually got rid of a powder room and we got a credit back for that.
We are new at this obviously but that's how it was explained to us.