Has anyone made Mason Bee houses out of tin cans for the paper tubes? The store said you could use cans that food came in but my tomato sauce can is just a tad too short. I think I'll look funny measuring cans at the marketto get the right fit with a little overhang. If all else fails my hubby is going to make me a wooden box. Any tips for building or attracting these bees? I have some but wanted to do more than give them a home in the few holes they find in my barn.