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Sprocket: Tank Design is such a fun game!
(reddthat.com)
I bought this game 3 days ago and I'm totally hooked. It's still in early access alpha, though.
This is my totally made up WW2 Japanese light howitzer, built from scratch!
It is currently singleplayer vs bots and the scenarios are admittedly limited. However, again, single dev (at the moment). Multiplayer is on the roadmap far in the future and will likely not really be pvp as that introduces challenges for balancing.
For now though, the designer is very free in what it lets you do for the most part and has a lot of options.
If you're on the fence, I would recommend looking up some videos on youtube that showcase the game's capabilities. Make sure to pick a decently recent one (ergo past half year or so).
If the dev got this working with MP, hell even just coop vs like a horde of tanks, with your friends, it would be awesome. Right now it looks like a lot of fun but won't last to long for me. I'll have to keep an eye on it.