[Fallen]

You might get requests to change it because of how "bulky" the model looks in comparison to a seeker of Slaanesh.

So that might explain your issue in the OP.

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In general though, if you customized it to be a "____" unit, use whatever size base that model comes on; which is what you have done!

 

[Fallen]

I'd have no issues with that, so personally I wouldn't even bother - however my FLGS and group are pretty lax on that sort of stuff.