This is just one of the parts I have printed with PETG for the build. I also printed a Dig servo bracket and a mount to move the steering servo from the frame to the front axle to add some non sprung weight to the front wheels.
Looks great, wish I could do some kind of CAD, any program would be great. I have a copy of Auto CAD, about 2005 version. I have not even installed it on this computer. I never understood how to use it. A friend took a course at the local community collage. He encouraged me to purchase a copy. I never got to build anything. He tried to help me through learning. I just got more and more confused. I think that I have a mental block because of that. He died back in 2020.
I was never good at drawing either. When I got my 1st 3d printer I tried using OneShape and was just clumsy & clunky to me. I then downloaded a copy of Freecad and started messing with it. Took a while to understand it, I mostly use the Part Design workbench. I have watched a ton of videos on it, some better than others. This guy has some good tutorials on Freecad he wanders a little and rambles a bit but seems to know it pretty well. https://www.youtube.com/c/MangoJellySolutions
Freecad is free and has Windows, MacOS and Linux versions, personally I use the Linux version. I would say download it and install it. Freeecad also has some good tutorials on their site. Start simple and work from there. Sometimes it takes me a while to figure out what I want to do but I just keep plugging away.
I agree with @Gramps about FreeCAD. You should certainly give it a try. I would also suggest signing up for the Community Edition of Fusion 360. It is also free. There are some limitations compared to the paid versions but I haven’t run into anything that’s limited what I wanted to do.
From what I’ve seen/experienced, people seem to get on better with FreeCAD or F360, but not both. I found F360 easier to use; @Gramps found FreeCAD easier. Try them both; pick the 1 that suits you best.