I used sketchup to design both my cabs, free for hobby use, fairly easy to learn, and lots of tutorials online, 3d is a plus.
I’ve dabbled around with fusion 360 as well which is also 3d and free, but I don’t think quite as easy to learn.
Attached is my sketchup file of my mini cab, I put a brief build thread over on vpforums: https://www.vpforums.org/index.php?showtopic=29303&hl=
good luck with your build, look forward to seeing what you come up with.
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