Bought mine in B&Q and had a great time putting it together - took about a week full time at it. Between siting it for the sun, digging out foundations, laying blocks, putting up the frame and installing the glass without breakages. Then out with the DIY electrics book, to get juice to it for lighting and heating during the winter (paraffin is smelly and dirty). Then out with the DIY woodwork book to build frames and a wall to wall latted table top.
Er.. make that nearly two weeks - but great fun and satisfaction.