Nice layout OZ.... LOL I see you have nest boxes for the guineas..... Bwhahahahah.... ahem er.... good luck on that.... Mine play football with their eggs that are randomly layed about the pen.
This is what I want to build for nest boxes. The video also shows how the gang is called in by using a bell. If you use a bell at feed time in just a few days they learn to come a runnin.... Helpful for those of us who free range over several acres.
This video is part of a whole series on Guineas.... Very good and fun to watch.
deb