I think children should be a long instead of a char. It eliminates the possibility of running out of headroom and modern PC's like grabbing entire long's at a time anyway. Lately I've been a fan of using 32-bit fields (longs and floats) by default unless there is a reason not to.
Edit #1: Well, some of the things we definitely need:
- texture
- vertex
- color (RGBA only?) (mapped to vertex)
- triangle
- texture coordinate (mapped to vertex)
- model
- bounding box (corner points)
- bounding sphere (center and radius, or maybe just radius if the center is implied)
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