Hi there, if your planning on wallpapering the system x wall shown here is how I do it.
First of all cut your A4 wallpaper into a rectangle that is the length of the entire paper but the height of the wall you want to cover.
Then pull the wall out from your building and lay it on the underside of the wallpaper so you can draw around the entire shape. I would suggest doing one wall at a time, when your more confident then you can try wallpapering around the corners at the same time, using the entire wallpaper sheet.
Take out any windows so you can draw around the opening and cut this piece out.
Glue the paper to the wall with paper glue, it's not as durable as other glues but if you change your mind it's a lot easier to take off than normal clear glue. As it's slower to dry it will also give you chance to line up the paper easier.
For the palace windows you have 3 options, leave it white as a contrast, paint it a matching colour or wallpaper it. If your going to wallpaper it you will need to cut out each surface and measure them to fit. Start with a piece of paper the same height as the section your going to cover and press it firmly onto the part. Run your nail along the edges to form a crease outline of the section which you can see when you flip the paper over. This will give you an outline to cut out. Then just keep repeating for each part.
I wallpapered all my older houses for Kirkbean Exhibition using papers from this site. The only problem was that they print on A4 portrait and I needed the landscape size so I just used papers that could be used any way round.
Hi Elaine if you want landscape paper, down load your pattern, open in paint, select all, copy, then paste 2nd image to right of the first overlapping where needed so the pattern matches up then just cut the double image down to fit A4 size.
Hope this helps