PP Box in the VW California Beach

Pimp the VW T5 California Beach
Replaced the Calipotti with an real Box for the Porta Potti.
I'm a little bit disapointed. The Box I ordered should be for the PP 135/335 Series. But the Porta Potti 335 Qube don't fit very well in the Box. You need force to put it in at the right angle. 90 degrees turned it would fit very well, but clearly no sense, because of the arrangement of the deck lid and position of the hole for the handle.
No, I didn't assembled it wrong!
Although the delivered parts for the box are looking very bad, not even like 2nd grade quality, more worse. And I ordered new parts.