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Recommended alternatives to SketchUp?
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For basic parts / geometry, I think FreeCAD will serve you decently well. There are several nice tutorial series for FC on YouTube and adjacent platforms.
Def stick to dedicated CAD software for your use case, though. You can technically use something like Inkscape for technical illustrations but I think it would become a bit of a battle. If all you need is 2D design, maybe LibreCAD or QCAD will work?
I really need the 3D modeling. I could do it in 2D, but at that point, I'd almost rather just draw it by hand.
I'll look at some FC tutorials.