To reply to the cab question....changes have meant that to get your vehicle changed to a motorcaravan it has to also
look like a motorcaravan and not just like a van with windows.
Motorcaravan certification means cheaper
insurance. Again I almost fell foul of this one as some insurers will not give you
insurance as a campervan unless you have front cabin to rear inside access and Dolmens for example require photos
and certificates of installation of certain areas before accepting any cover.
So yes you will only be able to carry passengers in the front which will a max of 2, but you may have to insure as a van with
a goods vehicle certificate which may be more expensive....it's going to depend on the insurer and whether the converter is
on an insurers list of approved manufacturers. Again it's the DIY conversions that are going to suffer the higher insurances.