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You want a low profile servo for the rotation, they're often referred to as a "steering servo" as they get used in RC cars with high torque requirements and limited space. Something like this:https://www.amazon.com/dp/B07G876LN6/ref=cm_sw_r_cp_awdb_t1_o33QCbWJK7FWMFor the extending fins you need a micro server, preferably with high torque, something like this:https://www.amazon.com/dp/B07B8SJQJD/ref=cm_sw_r_cp_awdb_t1_J93QCbQN1HX81Hope that helps!
Massive thanks to everyone who voted, and of course to Instructables/3DHubs/MakerGear for my M2 printer! :D Much faster, sturdier and more reliable than my old Ormerod V1, despite spending a lot upgrading it!
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