RE: Rapidstart migration issue w/ currency default
First you need to create a sample company and configure this company with functional currency of CAD through manual configuration within GP or using Rapid Configuration tool to configure the company with the functional currency of CAD. After completed the company configuration in GP, then use Rapid Migration Tool to integrate/migrate your data.
Note: If you need any helps regarding the same, please let me know. Because, I have some experience with Tool(Having experience with more than 5 companies migration).
Hope this helps!!!