Hello to all, i have just bought a vivaro swb high top to convert, i have never attempted this kind of work before so any advise would be greatly accepted, first off i am trying to get windows for this van, it seems there are two types, i would add that i would like the window nearest the cooker( when i get one in )to slide open and shut. is it a good idear to have a roof window? and finally how hard is it to get hold of a swivel passenger seat for this van type? are there any companys out there that under take this kind of work.