MK III starter kits, built by Hi-Tech, have been around for quite a while. We've been selling them to Canadian customers for several years. Nevada Classics (
Nevada Classics: Muscle Cars, Vintage Cars and Classic Cars for Sale) has them available today.
While we don't sell the components you will need to complete the starter kit, we can refer you to US and Canadian sources to purchase the requisite "donor parts". This isn't anything new, and it is perfectly legal.
There is NO REQUIREMENT to purchase donor parts from Canadian sources. Because of NAFTA, you can order parts from the US or Canada to complete the project, and be exempt from import duty except for GST and PST. (Note, there is no PST in Alberta.)
Transport Canada does not allow a rolling chassis to be disassembled and sent across the border as parts, then reassembled as a rolling chassis. Nevada Classics sells a starter kit. That's all. If you want to purchase the rest of the parts necessary, we can refer you to a number Canadian and US resources that will supply them.