I could be wrong, but glancing over your map from a climate perspective, the eastern edge of that NW continent looks to me like it will have primarily a climate similar to that of New England and Eastern Canada, for the most part.

As for plate tectonics, it looks reasonably possible, to me. The central continent in the western hemisphere seems to fit reasonably nicely into the gap Southeast of it, if one rotates the island-continent about 60-90° Clockwise.

The more I look at this, the more ways I see that it could fit together.

There is some strange wrapping in the southern continent, when one maps to a sphere. The polar distortion there is quite severe.

-asp