Basically I belive if you own this shell then there are many companys doing this type of work, The ZOM (Züri oberland messe) in Wetzikon would be a good start, its a Swiss version of the ideal home exabition but im not sure when this is. I believe it is in the summer so you have missed it for this year. If the shell is rented then normaly the owner will decide what quality he wants fitted.

DC