Upgrading to Double Din head unit

IAB

I have a Knaus Sport T1 Motor home on a Renault Master chassis. I want to upgrade the Sat Nav, Reversing Camera and Media system to a Double Din head unit that would incorporate all the functions in the one unit. I have upgraded a campervan in the past and
fitted a Kenwood unit which was very successful. My problem is that there does not appear to be any company that wants to get involved. They say that there isn't a conversion unit for a 2007 Renault Master or will not even answer an e mail. What I need is
an Auto Electrician with the requisite skill, I can get a bespoke panel made to house the unit but am stuck on the technicalities of installing a system.