tetrahedron in tetrahedron

Back to geometric beadwork. I started this tetrahedron piece a while ago and sort of bogged down in the middle of weaving it. But I really like it now that it's done. I have 2 pictures because it's hard to capture the 3 dimensionalness in a picture (at least with my level of skill at photography). The problem is that the last thing you do is add the little lilac seed beads along the edges and that does alot to firm up the structure because it is a straight piece of monofilament running down each edge. So all the time you're making it it's way too floppy, and there's no way to know till you're done whether it is going to firm up enough to make the whole piece work. I had made a considerably smaller version, but, of course, as you get bigger, you tend to get floppier. Fortunately it did firm up quite nicely, and made a good piece.
I ought to add that the beads are around 15mm long, and the large tetrahedron is around 7" on a side, although it isn't in front of me now, so I can't measure it.