I have a few suggestions. I'll start with the cheap first. I go to the convience stores and get their iol jugs and cut the top out and wash then put wood chips inside. The ones I get have a cardboard box around it. I take the plastic jug out and cut the top off then wash the oil out. Then I redo the cardboard box with a little trumming here and there then put the clean dry plastic "instert back in the box and use bread ties to attach the flaps back to secure the box to keep it from crushing. I'll see about getting some pics for you today.
The second would be to add a edge to your shelf and fill it with wood chips or straw. They will make their own nest.
The third is to use small plastic containers and fill with wood chips or straw. You can get them at any Dollar Store for a few bucks. Or may have some laying around.
I've used all 3 of these ideas and it just depends on the bird as to what they want to use. I let them make their own choice. My Onagadori's like the plastic tubs and my EE's prefer to make their own space on the shelf. My silkie roo likes the plastic tub. (I think he's confused)
I use milk creates with one side (waffle down to soild) cut out and to secure them I cut 3/4" press board and screwed it into the creats and then covered that with floor tiles (the kind with the sticky backs on them) I had them laeft over from another job I did then I put pine shavings inside them makes for easy clean up.
If you go with buckets and shavings rememeber to cut the lid down to keep in the shavings.
I use milk creates with one side (waffle down to soild) cut out and to secure them I cut 3/4" press board and screwed it into the creats and then covered that with floor tiles (the kind with the sticky backs on them) I had them laeft over from another job I did then I put pine shavings inside them makes for easy clean up.
If you go with buckets and shavings rememeber to cut the lid down to keep in the shavings.