layout

This is my current layout. Looking through everyone else's setup, it seems more common to put the hay in a tray/box or something similar. How often do you top it up? I'm worried about them not having enough hay particularly through the night. There'll be some hay sacks made as I'm considering...

Hi all... Looking to get Guinea pigs in next few weeks and doing homework. Have bought C&C page with loft and also Vetbed as my son has allergies that this should help with. Trouble is I don't quite know how best to set up cage to accommodate toilet, beds, eating. Happy to use hay in any area if...