How make an elevator like oil derrick and sky tower ?

[SuRCT]

Hi I'm new here, I played Roller Coaster Tycoon 1 when I was a child and I come back many years later to play the 2 ! I like very much the scenery, but I have a problem. I know use shift + mouth to build height, but I don't understand how the two elevators Oil Derrick and Sky Tower can exist ! It's impossible to build walls and blocks so high. I tryed a lot of things but I can't !

I took a screen to explain the problem : http://http://img15.hostingpics.net/pics/599465SCR1.png (http://http://img15.hostingpics.net/pics/599465SCR1.png)


You can see to the left I know how to do if the elevetor is little, but if it is too high I can't put the walls and the blocks. I tryed with the original sky tower whithout scenery, and the result is the same.

To the right you can see the max I can arrive with blocks.

Is it possible to make this towers oneself ? Thanks and sorry if you don't understand all my english is bad !

[Terry]

The Ctrl key allows you to place scenery at a fixed height without having to start from the original ground square every time. It would be very difficult to build scenery several hundred feet high using the shift key alone.

[SuRCT]

Ohhh thanks !!! It's change all ! It will be very easier now ! :)