I've created a Windows 10 ENT LTSC image...

[chants]

Yes it would be interesting to know the dism commands needed to shrink it precisely. In fact better would simply be to distribute a provisioning script in addition to the release. With each component you strip out come subtle consequences as MS redesigns certain parts. Especially the Windows Store app stuff is pretty heavy, but they have added countless other services and such now.

Under a gig is ideal plus mainly oriented towards reversing desktop apps is most likely useful. Though admittedly reversing store apps will be come more and more important in the future.