I have no idea how hard the alternate forms are to program for polymorph self (I just found out I could use my craft menu to select them) but I was thinking polymorph self into an animatron would be a cool option to match the EFU setting.

I want into polymorph to Samuel L. Jackson!

You just want to do that so you can have the Wallet that says "Bad Mother F****r" on it.

You cannot polymorph into constructs.

Why not? Is it just limited to shifters?

3.5 spell Description.

This spell functions like alter self, except that you change the willing subject into another form of living creature. The new form may be of the same type as the subject or any of the following types: aberration, animal, dragon, fey, giant, humanoid, magical beast, monstrous humanoid, ooze, plant, or vermin.

While the Shifter has a class ability to turn into a construct.

But the other types open many opportunities!