I came up with a rough concept for a handheld kerbal controller and doodled it. The central buttons and their placement are easily up in the air but my strongest thought was
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The most dedicated Kerbal Space Program players build amazing custom controllers | PC Gamer
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Behind the Build of Flight Control
Building A Better Kerbal Space Program Controller | Hackaday
Optimal Way to play Kerbal Space Program : r/KerbalSpaceProgram