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Also here's a bubblepins video Tearing & Deforming Metal (there is an RBD Deform Pieces SOP he/she is using) https://youtu.be/nE2LzxDkPRY?t=1194  

Using glue constraints and meshing the constraint geometry is perfect for melted cheese!   glue_constraint_cheese.hiplc

Yes that is "correct", as in what happens when you run it. It's not obviously a result I want in the end! This is just the beginning of my setup rather than anything anywhere even close to part way through! I was more just curious as to why the polyextrude means the sim doesn't run? (as I was building a much bigger more complex setup). Yes the level of RAM needed is excessive too, so I need to optimize anyway. If you did get it to work you'd see the fracturing isn't very consistently sized and shaped anyway so that's another problem. I just wanted some thickness and it to look better than the problem I had. Funnily enough with the new setup that I was forced to create to fix your initial problem with my stash, that problem disappeared: must've been because of running unpacked geo into the RBD fracture.  

First of all, opening the hip, running the sim gives this result: Is that right?   Now, enabling that Polyextrude SOP drastically slows down the setup. I tried to cook the node tree, and already at the constraint creation i ran out of ram (32 GB), unfortunately i can't check the simulation with the Polyextrude ON, my machine can't take it. All i could do is to select a small portion of the spaceship, blast the rest and run the setup with that, but in that case the sim was running. (however still got crazy)   I actually don't see what is your problem with the geometry with the "without polyextrude" version. Could show a picture maybe where the problem is visible? Rght now I rather worry about the simulation  

Yeah, vellum is the key here. I'm testing several vellum options. If anyone is interested, I will post the hip here once it's ready...   Flip based sauce (not quite right at some places)   vellum hair based cheese   another vellum hair starting point   here the sauce simply comes from the shader