Posted: 12/04/2013 at 10:02
I do think you would be wise to use the base, as it does give the greenhouse more rigidity. And it has the fixing holes ready drilled for fixing to the ground/concrete/wall...
I don't think it would detract from the final appearance of the construction - indeed, I think that NOT using it would give you the added problem of how to attach the superstructure.
I've been poking round t'internet as well, and found nothing!
But there's this link (on this site) on general greenhouse construction.