I have used lwb T5 kombis for the last 8 years, currentl on my 3rd. All have been high spec and used as the family vehicle for holidays ect( 4 kids)
I have tried over the years lots of different storage designs, a Motexion bulkhead behind the 2nd row of seats makes the cab very quiet, safer, and dust free.
In the current kombi I had the rear seats removed and Caravelle rails fitted and new seats ect, with the intention of it being turned into a camper van. This hasnt really worked as the new triple seat/ bed was getting damaged and was noisy when going out with the family, emptying the van at weekends a real pain.
Every night having to sort the storage area for the next day has eventually got to much.
I have bought a new T6 California for the family use, removed all but the 2 front seats and now have a proper van.
In summary yes it can be done, you have to be really strict on what and how you store your equipment.