It seems that there is nothing wrong with your model, but that you are getting lost in the virtual space and looking around, not seeing your model.
There is a huge difference between something not being where it should be, and not SEEING something that is there.
So, a parallel projection should do the job. Always.
Read up in the Help on the parallel projection, I am sure you will get a hang of it.
Djordje
ArchiCAD since 4.55 ... 1995
HP Omen