I'd guess he'd be pretty receptive, based on the fact that he has used Starfleet Command models in the composition of the covers for his novels.
I'm sure that you are fully aware that his novels are based on the FASA Star Trek supplement The Four Years War. I bring that up simply because you may be treading into FASA Copyright territory, and I'm not sure if that involves IP hell or not...
As I said, I'd think that Stephen will be pretty receptive though.
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I tend to email both, but only use the idea and then story from the book. I will email both and ask.