Hello everyone,
Here is a helpful drawing for you to grab a crayon (or Photoshop!) and start sketching.
The grid shows the topo survey by Symo, surrounded by a grid to the sims east and west.
The grey lines are a grid of 8*8 m, thus 64 m2 in area.
The green lines are a grid of 16*16m, thus 256 m2 in area.
These should considerably help to sketch the layouts.
Also, the image is scaled so that it will fit an A4 in most printers, though with a not very good resolution 
Have fun!
