I know this post is 4 and a half months old by now, but I just found it, because I'm researching immigration into Canada right now. I bought my bus 3 years ago, and am well into conversion by now. Kind of on the home stretch actually. And of course I'd want to take my new home with me into Canada.
I see your link, thank you. Knowledge is power. I have some links of my own:
^ A copy of my state's requirements to convert my bus to an RV.
^ A copy of Ontario's requirements to convert a bus into an RV.
DAMN those lists look similar.
^Yes I know, third party link, not .ca, but a handy source of info nonetheless.
^Lots of nice contact info, websites, and phone numbers!
Also, in that link you shared, at the modified/altered vehicle section, it said this: "Importers considering the importation of a modified vehicle or Canadians planning to have modifications made to their vehicle outside of Canada must inform themselves about the need for compliance to Canadian standards which must be established by the final stage manufacturer (or modifier). Failure to establish compliance to Canadian standards will result in the vehicle being denied access into Canada."
It seems to indicate it's not a HARD 100% "No", more like, "Standards must be met." Which makes sense, to be expected. So, without further ado:
^Also I found this!
Looks like you bought a bus in Saskatchewan, SWEET!
But I guess that means you're not interested in this answer anymore... Maybe someone in the future will find some value in it. Certainly I hope my labors bear fruit for my DreamWeaver.