Make a heliport

Ok I have tried many times to make a heliport with a new airport code so that I can get into the sim and fly to it using the code. I have failed measurably. I have tried to follow the youtube videos on how to do it but not much luck. I want to build a heliport in the Rocky Mountains in Colorado at dream house. I have tried a couple different ways. First I stared a new project and place card, added new airport and my own code when it gives you the three options. Then in objects have added airport, Apron, hanger, helipad and windsocks. I save the scenery and go to build and get a ton of errors. Then everything disappears except the hanger and windsocks.

The other way I did it was stared a new project and place card, added new airport and my own code when it gives you the three options. and everything else except add new airport but when I try to save it it tells me that I am to far away from the airport.

Thanks