Raz,
I have bought three new boats, two directly from manufacturers and one from a dealer. You start with the base boat and then tick off the options. On the boats from the manufacturer, all options were installed by them, on the boat from a dealer some options were factory installed (larger
winches, Yanmar engine etc) and some were installed by the dealer (canvas, instruments etc.). They will give you a delivery date but unless the boat is already at the dealer's yard the delivery date is only an indication of when you'll get the boat. If the boat is being built it will depend on the size of the manufacturer's order book. You will have to wait until all those ahead of you get theirs. In the boat building business there seems to be a lot of delays, especially with smaller manufacturers, however even with large manufacturers, delays often occur. I think there's a few threads around about delays from Lagoon 420 buyers. This is a new model and there have been plenty of delays.
I would not bother with a survey of a newly manufactured sailboat. There is a warranty and your best bet would be to order a boat from a manufacturer who has a record of treating customers fairly and who is fiscally sound. The manufacturer usually has a lot of your money by this time and it would be extremely difficult to pull out of the deal. It's not like buying a used boat contingent on survey and sea trials. On the Bavarias with the keel problems I do not think a surveyor would have caught the defects. I think Bavaria did correct the manufacturing defects in that model, (a bit late, mind you) think it was a 40.