Most of it can be done there, but your machinery will get pretty rusty in most parts of the country. You will need to bring the heat up to upper 60's or warmer while gluing things up and tapering or you are begging for problems.
Keeping a dehumidifier in a non-climate controlled room is a good idea if you plan to store wood there.
I used to have a garage that I did some work in that was not heated. I got one of those contruction blowers that runs off of kerosene. It could heat it up in a hurry in there. Other than the smell and the fact that I set my pants leg on fire once while standing too close to it, I have no complaints. Then I invested in insulation and some plywood walls and mounted a electric heater in it on the ceiling. That was much better. I could bring the heat up in a hurry with the Kerosene blower and then turn it off and let the electric heat keep it warm.
I still have one non-heated gargage that I do my sawing and such in.