Should you do a bus conversion .You must notify dvla and either send pics or let them inspect the vehicle after the conversion. Then they put m,home on the log book .Thats the important bit, as mot and insurance then know it is a m,home. different mot for campers to trucks n buses . It can be done its not that hard but some people struggle to get all the correct routine right ,then get confused with where to go next. at one time you just did what you wanted filled in the logbook sent it off it came back m,home. I say have a chat with your local dvla office ask for their definition of a m,home work with them and it can all go smooth.
the licecing is something else to talk with them about,get it right as it can be expensive if you do it wrong.
still dont know what licece op. as got ,come on tell us .we cant keep guessing.