Design your own staging!
You dont say what type of heli your working on - Two places I've worked at have had there own designs made by a local company - one made two sets for deep stripping Jetbangers and another place made a very special set for a very special eurocopter!
All you really need to know is what height you want to work at and design your staging to suit.
Remember the rules on the hieght from the floor.
Make sure you divide into suitable movable parts that can join together to make a larger working area.
Add all the things you need (air points, elect points, shelving etc)
Make sure you choose wheels that can move across the area outside too! I learned about that one!