Harveyc
Before you buy this greenhouse you should know that it is fabricated with extruded aluminum no thicker than .030 thick. As is ,it will not stand up to very strong winds. Here is a link about the problems with these greenhouses and solutions to strengthening them by using EMT conduit. Pay attention to the problem of the base frame of the unit also.
I understand that after the modifications are done, you will have a much better product.
Here is the link.
http://forums2.gardenweb.com/forums/load/strucs/msg0113112919846.html?41
Karl