I copied the code for [DBRIS1SM] in artmd.ini and made one for [REAPERTURRET].
I put REAPERTURRET in the [Animations] list and [VoxelAnims] list but it doesn't appear.
The code for REAPERTURRET is in artmd.ini where DBRIS1SM also is.
I tried using DBRIS1SM on the warhead and it does appear.

Also DBRIS1HV doesn't work. It's part of the original game and uses Image=DBRIS1SM.
I wonder if Image= also doesn't work with DebrisAnims=.