Welcome aboard. We specialize in helping folks install any precast oven, regardless of who made it, and we get lots of nice emails from people we've been able to help. Just remember to tell your friends to buy a Forno Bravo oven next time.
Take a look around the forum, and download the Casa installation guide for any help you need.
Yes, I would recommend a seven day curing, even for a precast oven. You are going to a lot of work to install your oven, and curing it slowly will help it last longer, cook better, and reduce the risk of anything going wrong. I think it's worth the effort.
Enjoy your oven -- and send photos when you are done.
James