Cutting/moving section out of 3d curved object

Hey guys, here i have a catapult design. i would like to move the sections highlighted in red as they will be removable clips that will be tightened by bolts.

Is there any way to remove/move the sections as highlighted (but obviously with clean cuts around the corners etc.) i thought about manually drawing lines around the corners where the curves are but i doubt they would be perfectly in line and it would be very time consuming. Image attached! Thanks in advance!!

If you intersect a face at the point you want the line around the corner you will then be able to select the area you want and make it a group.

A simple version.

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