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Yes, the tips of the tail spikes do get very thin; maybe I should thicken them up a bit. Or, I already have a version without them...
If you have access to CAD software, the STEP files or ParaSolid assembly are there to import and adjust.
The design was done using SolidWorks and a design table; it's all funny angles and dimensions and took a fair amount of tweaking.
I might try making a simple peg-and-socket block unit (as an STL) that could be read in to OpenSCAD and extended...