What is the plan, are you going to be self-contained touring, living off what you can carry on the bike, or are you going to be staying at hotels and motels and eating at restaurants along the way?

The first option is MUCH more demanding on both you and on the bike.

Since you are riding for a cause and canvassing Canada and starting in Vancouver, I would give a shot to contacting MEC, which is based in Vancouver and is a proudly Canadian company, and trying to get some for of sponsorship, up to and including the bike itself.

MEC has several touring bikes in their collection, including the National, the Nineteen Seventy One and the Cote models.

Another Canadian maker worth trying is Norco, also founded in British Columbia in 1964, and their touring bike line is called the Cabot.

The pitch would be you would stop at various MEC stores or bike shops that carry Norco (I think they all pretty much do in Canada) and give talks/summaries of your adventures to date and updates on the progress on housing the families you are trying to help back home.

The only custom touring bike builder I'm aware of in Canada is Ontario-based True North, and that would be your best bet in terms of quality and fit over any mass produced bike, but a harder deal to swing for endorsements/support I would imagine.

Last thing I'll mention is that if you ride a 58-cm frame then you are not a short person and you don't need to use 26" wheels for sizing purposes... you will have no problem finding 700c or 29er parts and tires anywhere in North America, so keep an open mind with regard to the bike.

And I didn't mention it in so many words, but if you've never built a bike before from a frame, I personally wouldn't have my first build be one that has to get me across the continent. I would return the frame or keep it for a future build, but for what you are trying to do, you need that thing built right the first time.