Smallworld is an automated facilities managment package sold by GE. You can find out more than you need to know at:
If your just going to do the design and drafting, the company will have to supply the modules you will need. Because it is a very expensive product, and I dont think you can buy just parts of it. It is a total solution for system managment, not just a design package. On that site above, read some of the white papers and you will learn what it is capable of.
Good Luck,
ST