My complete Cali install was cheaper than other manufacturers offerings. 3 SH Cali rails, as new T6 seat / bed, rear "parcel" shelf and mattress etc came in under £3K. I installed the rails myself as it's not that difficult. Setting the floor height is the trick to ensure it looks right.
It provided flexibility and to me looks the part too.
I see why you mention you need a large wallet for the VW's
Thanks for the tire size T Shine