scalescenes.com Coal Office I was building. I'm not sure why it's taken so long to write this post as the building was essentially finished at that point. Anyway, at long last here is the completed building. It's not perfect, but as an experiment to see how well these print-your-own cardboard kits work I'm happy to call it a success.
Most of the problems with the final building can all be traced back to the rather poor quality paper the original sheets were printed on. Not only did this lead to the paper tearing, but also it isn't thick enough to hold it's own weight when used without being stuck to a cardboard backing; look at the barge boards on the side of the roof. This is, of course, entirely my own fault and not a problem with the kit.
The kit itself is well designed and thought out. It was also easy to assemble. In the second photo you can get a better idea of how the kit works. Essentially the walls are made from two layers of 2mm cardboard stuck back to back. This makes for a very rigid yet reasonably lightweight structure. The use of two layers of cardboard also allows for details, such as the drain pipes, to be modelled in relief, rather than simply printed flat, just by making the inner layer of the end walls ever so slightly wider than the outer layer.
While this specific instance isn't built well enough to grace a layout I'm certain I'll be building more models in this way in the future. The main things I've learnt from this experience is that I need a sharper modelling knife (cutting through 2mm cardboard is actually quite hard) and to print the sheets (at least the coloured outside layers) onto reasonable quality paper. Of course having paid for the kit (if you remember it cost just £2.99) I can easily build as many copies until I'm happy for just the cost of the plain cardboard (which is pretty cheap).