Circuit is not reverse-polarity protected

[yope]

No idea if feedback on the schematics is desired, but since I am looking at them I will just file here all the (potential) issues and possible improvements I find, in case anybody is interested.

The tranzorb D2 (JMBJ14A) is unidirectional. Although there is D1 probably intended to protect the circuit from reverse-polarity damage, it does not work due to D2.
In case the circuit happens to be connected to reversed polarity, D2 will short-circuit, and race against the fuse in which one will die first. Tranzorbs are designed to hard short-circuit if blown, so the fuse will also go in the end. Note that the tranzorb will stay in short circuit, so replacing the fuse won't help.

The next problem is VIN2, which isn't protected against reverse polarity. Q6 will conduct through the body diode, and so will all the output transistors and depending on the load connected to them, other damage might occur.

So either D1 is useless and no RP protection is intended, or these issues need fixing.

In any case, an easy fix for the first issue would be to use the CA type (bi-directional) for D2.

A suggested fix for the second issue might be to use a heavier diode for D1 and connect VIN2 behind it (on the kathode side).