How firm a foundation?

I recently got a call from our builder to schedule an appointment with us for our "pre construction meeting". I was a bit taken aback by this, since we were previously told our new house wouldn't begin construction until there was a contract on our current house. Apparently the builder made a unilateral decision to start construction on several houses in our new subdivision. You'd think we'd be happy to see our new home start going up, but we had planned on having extra time living with the in-laws to save up more money for a larger down payment and some other incidentals involved with setting up our new home. Alas, that was not to be.

Jamie & I decided to run by the site on Sunday afternoon to see the foundation slab which has already been laid. For your education and entertainment, here is Lot 114, with a foundation for our house firmly set in concrete:

Jamie modeling the slab

While walking around the foundation, we noticed something disturbing -- we're no experts on home construction, but it appeared to us as though the back part of the foundation wasn't big enough to include the sun room option we had picked for this model of our home. That's a BIG deal to us, since the size of the main living area (including that sunroom) was one of the biggest selling points on this house for us. We mentioned this to the salesman on duty (who, by the way threw up some lame excuse about his phone going out on him as the reason why we never got the message he was SURE he sent us about our home construction starting -- yeah, right), and he assured us that he would have the person in charge of overseeing the construction call us on Tuesday. That is TODAY 05/27/2008. I'll let you know if/when we hear from him and what happens. Jamie & I are starting to get a little wary of this builder, since this isn't the first time we were told one thing had had something different happen regarding this home. If you read this, throw up a prayer for us that God will make things work out, or else give us a peace about moving on from this situation and waiting for something else to happen on the new home front.

UPDATE: 05/27 5:10 PM: Knowing the track record of the salesman at the sales office for our new subdivision, I decided to take it upon myself to call the construction supervisor to check on this, since I hadn't heard from him as promised. As I suspected, he knew nothing of my concerns about the foundation (the salesperson apparently had NOT contacted him, as he said he would). The construction supervisor checked out the foundation and called me back within minutes of our first conversation. He verified that the foundation does indeed include the sunroom, so all is well with that. That's ONE thing, at least. Check back here for more updates in the saga of the home build as they come in!