Birds would feel more secure in darker rather than lighter . . the same reason as VP's box has small mesh 'portholes'
Rather than perches, I put in small sprigs of Tea-tree brush, large enough to allow some movement but to restrict panic movement
Doors need to be just large enough to accommodate a fist holding a finch for putting bird into the box, and the sliding exit door thet VP mentions reduces further stress when releasing
Water containers should not be placed in corners because finches will often jam themselves between container and wall, with fatal results . . a hole can be drilled directly above and container filled with a sryinge with a tube
Seed only needs to be put on the floor, but be sure to empty it out after use
Plenty of other ideas that others will contribute
