Has anyone seen a list of all of the parts for these various... things... and which figures they came with?
I believe each repack has a new pack-in. So if you aren't buying the repacks or the carry-forwards, you're not going to get all the worthless pack ins.
Yeah, like Dave says, to build the weapons, you need to buy all basic figures so far. Skipping repacks or new card variants will create gaps in your parts.
We've got a list right here that shows the sets of three for each new "build-a-weapon" (along with a home-grown numbering system to link them together - ie, you need to buy all three SN-02 figures to build that weapon).
Failing that, didn't each figure come with a little insert showing which figures you needed to complete the "build-a-weapon" thingy?