You have my heartfelt sympathies Lucho - we bought one of these last autumn and it took two of us about a month (on and off!) to get the thing completely built and fixed. Most of that time it was standing in the dining room and we had to walk through/around it to get to the back door! As you say the instructions are less than helpful and the drawings don't make much sense - it's trial and error most of the time. Blurred printing on both sides of ONE SHEET of A4 paper is hardly adequate! Make sure you've identified all the pieces correctly as some of them are alarmingly similar and some aren't even marked. It actually makes me very angry that when you buy a "greenhouse" you're not actually buying that at all, you're buying a kit - all you get is a pile of metal bars, several hundred screws and bolts and a few pieces of glass or plastic. Trades Descriptions Act anyone?
Having said all that, now that it's up and running we're very pleased with it. (One of the many things they don't tell you in the instructions is that you can hang the door to slide either way so we changed it round.) You need to make sure it's very firmly screwed to its support (ideally a wall, not a fence) and also to the ground. We used hardwood fence posts laid out as a base.
I would also recommend a solar-powered ventilation fan on the roof as it can get extremely hot when the sun shines. Puts the price up a bit but it's worth it.
Hope you haven't given up completely. You get a lot of growing space for the price but Norfolk should definitely improve the instructions so they're comprehensible by normal people and not just those with a Masters' Degree in Civil Engineering!
