I can't answer from direct experience. I let my 996 Targa sleep through Boston's winters and I'm waiting until the spring to get a 997 Targa.

But, I don't think that there's any way that four tires will fit inside. You may fit two, but that's it.

As for driving in snow with the stock summer tires, I've had only one experience. During my first drive home from the dealer after picking up the car, I got caught in a freak early-April snow storm. I was terrified . . . and I'm not sure whether it was because the car was not handling well or whether it was simply that I feared losing my first P-car only miles from the dealership!!!

Anyway, I wish you luck. I'm really excited to see pics. And btw, I'm blown away that it's cheaper for you to buy in the US and do the mods to make it Canada-friendly. It's amazing . . .