Picture posting is enabled for all :)
If you want to get serious, Emily'....put the greenhouse on your cement base. Draw a line around it when you're sure you have it square. Lay one or two course of bricks on the concrete-dry. Test the greenhouse on the bricks. when OK, cement the bricks in place and screw the green to them. This not only seals the bottom of your greenhouse and helps keep the bugs and rain out, it gives you extra height.Stuck with that? Give me a shout.