So exciting! He looks great! Watch the fresh stuff that isn't high in Vit A. Cucumber basically water. Focus on the red, yellow, orange veggies. Linnies need high protein, so don't go too crazy with fresh. They need room for stuff with fats and protein too. Hey, if you want to work on step ups, wrap your finger in some vet wrap
(like this HERE) to provide better grip. Their feet are very funny... flexible but not all that good for perching on wide diameter areas. Australian species have long, slender toes and it is easier for them. I find grip on wider perch places really builds confidence. Keep us posted on how it goes, and when you find a solution for wet poops down your neck when he is all cozy in there.... share!