Voron allow you to configure a printer and the provide a spreadsheet suggesting the sources for buying the parts. They aren't region specific but most of the vendors are multinational.

I stumbled upon local (in NZ) maker sites by searching for the relevant components, e.g. stepper motors 20x20 extrusion etc.

Using site:NZ in google for local searches for me, maybe site:ca for you?

Have you ever seen anything like this? There's no need for a massive beefy frame, all you need is a jig to rotate your subject relative to the camera. You can do this with a fixed camera while rotating the subject around two axis or you can rotate the subject around one axis and the camera around another.

Spool3D has a fair assortment of printer parts, although I don't know if they have exactly what you need. They're in Calgary. I've ordered from them once, although it was just filament samples, and got everything in a reasonable amount of time.

I'm wondering the same, but for the US. I ordered from banggood in years back, but it was hit or miss.