You might haven noticed the admiral pointer on the knob is not a straight rectangular cubic but have a curved arch. There is a youtube video showing how to take coral draw to engineer a complex curve and importing into TinkerCad. I used a similar approach but used MS Paint to create an outline of a solid object. The MS Paint drawing is of the side of the object (2D drawing). You can stretch the width later after it's an STL. I then used online program
https://imagetostl.com/convert/file/jpg/to/stl to convert the JPG to an STL. The default is the object needs to be white with a black background. After creating you download the curved object so you can upload to TinkerCad, Meshmixer or other program.
The attached file shows:
Blue pointer - as produced by JPG to STL
Grey Pointer - Blue pointer smoothed by Meshmixer
Red pointer - I took the yellow half cylinder; cut it in half with a cube hole; stretched the part across a rectangular cubic for left 2/3rds and used a 2nd cubic for the remaining right side. 3 parts total: The yellow object was stretched and sized to create the top left of the red pointer. Cubic across the bottom and a cubic on right. The parts were all sized, aligned and grouped.