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Squeezeplayfag back again, ended up using Triggerhappy's thighs after all with Highbrow's hips to get them to fit on Mindwipe's waist section.
Had to drill out the peg hole a bit to make them fit over the peg in Squeezeplay's leg but it fits fine. Also had to cut away some of the thigh to allow it to bend properly, as you can see in the picture it's not the best articulation but a 90 degree bend is decent enough.
The height of it is slightly smaller than your average TR Headmaster and more on par with that of the old Headmaster Jr's as seen with Wilder here which I think works fine.