I'm using FreeCAD for loudspeaker design - just the VERY basic design to be sent to the woodshop to build the box (just the wood part).
I prefer local tools installed in my desktop, that's why I chose FreeCAD. In addition, there is a lot of material on YT.
FreeCAD is really not intuitive, I gave up around 3 times but I finally could minimally understand how it works at least to build a loudspeaker box, the holes, the speakers (revolution) and the bracing.
I've written a small and very simple tutorial just for this job - see attached - nothing advanced, just a very basic step-by-step document (and some concepts) to not forget what I've learned and it is limited to the speaker box design.
If you just want something simple like this, we can discuss, if you're interested.
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You should take your time and learn the basics academically, i've often redrawed my parts many times and some simple parts can takes many hours when you learn. You will face big problems in the future if you succeed to draw your parts without any basic formation.
You can use Tinkercad. It is Free and browser-based. It is very beginner-friendly. Tinkercad is Ideal for simple mechanical parts or enclosures like this.
https://www.pcbway.com/project/shareproject/bin_for_storage_and_organasation_6fddef2c.html
It can export to STL and SVG (no direct DXF, but a workaround is possible). However, Tinkercad is not suitable for more advanced shapes or assemblies. It is best for super simple parts or quick prototyping.