Summer house ideas

We spent a fair bit on our and me and a mate put it together - he did about 75% and was the 'brains' of the operation. We measured everything 3 times, made sure that the base was solid and square - then spent two hours after we'd put the wall up wondering why nothing was square - we forgot that the wood structure was reliant on being pulled in together - so rather than put the roof on (which fundamentally would have pulled everyrhing together - we lashed rope in just to be sure we'd done it right.
We had, we (he) was just more used to construction with bricks and mortar...

Double glaze. Insulate.