Hi Dream Home,
Is the driveway cutout where you want your driveway to go?
We are moving ours to the other side, which we can do - when we put in for council approval to get the driveway done we get the approval to change the gutter at the same time. The concrete does the driveway will then complete it for us. The developers have confirmed its ok.
In regards to the pipe, have you double checked the site plans which should show anything running through the block. The developers should also be able to tell you what it is. If you have to build over it or near it you may need extra piering or the pipe to be encased.