I'd stay away from particle board (and MDF, plywood, etc.) as it's filled with toxins (trust me, I built an indoor aviary for them last year). Instead, see if you can get a huge slab of balsa or something. Or mahogany pods. I think I'm one of the few people on here who buys mahogany pods for their birds, but my guys go crazy for them. They're intended for smaller birds since they're so soft (even I can easily shred one apart without a problem), but they're really fun. You could hide them throughout his play area, or stick slices inside of foraging toys or something. Ooh! Look up cork branches for reptiles and amphibians!
Hey, what about making a foraging toy from a pill bottle? I unfortunately lost the lid to Noah's foraging bottle (my parents threw it out). Guess I should make a new one for Christmas.
For Christmas, I'm making my kids a gigantic atom (think African grey-sized). I've ordered the parts (Supreme cotton rope which is unbleached and easily digested, stainless steel wire, stainless steel bell, stainless steel chain, maple leaves made from pine, daisies made from pine, Marbella rings...), so hopefully they'll be in this week. I want to make one so large that all the birds can hang out on it at once without bickering. I know budgies are supposed to be cuddly with each other, but my guys tend to get on each other's nerves.
I also ordered pinenuts with the shells still on for the kākāriki, along with palm oil since the kākāriki are still really underweight (they keep getting infections).
Oh gosh, my dad his the freaking radio on, and it has a local children's choir singing, and it sounds horrible! They're all off key and it's absolute torture! Man, I've never heard such horrible singing from children before!