Is the freehub body where the cogs can be mounted in any configuration? Because I have a LOT of those cogs (up to at least 28t, maybe 30) and can make you a cassette with little hassle.
Edit:
Here's the breakdown of that pile of parts:
2 x 30
1 x 28
2 x 26
1 x 23
3 x 21 One is brand new in package
1 x 20
4 x 19
2 x 18
4 x 17
2 x 16
4 x 15
4 x 14
3 x 13
1st position cogs behind lockring 5 x 12; 1 x 13.
5 lockrings
33 black spacers