OK, seen the other thread.
As long as you understand your channel requirement is unlikely to be realised full time with a 1.2m dish then the system can be installed as it is.
However for any long term reliability you will need to have more than just a DiSEqC motor. A polarmount compatible dish, VBox and linear actuator is the option (along with a short run of proper actuator cable between dish and vBox).
From the above revisions you will find something other than the (UK supply of a) 1.2m Gibertini will give you a better resale value should you need to upgrade, but I would still recommend a 1.5m to cover the eventuality of you not getting signals in most weather conditions.
Tell the wife that the larger dish came by mistake.