If this was going to happen then I could help with the programming side of things. I already know quite a few languages (C++, C# to name a few) so the syntax of LUA will be easy to pick up.
Do you guys wanna take a look at the starter kit I have? I'm not very disciplined in Lua so I have no idea what's going to break or not. Sleggie just message me on Steam if you want it, Tweezy just find me on steam or PM me here.
Honestly I don't know about the license. I've been searching around and haven't found a "purchasable license" besides shitty youtube videos advertising "PERP GAMEMODE FOR SALE WE SELL PERP" and threads on FacePunch saying there's no such thing just children DDoSing you and fake DMCA notices.
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Used to play on Hellzone Perp. It was maintained such as: Minges / rulebreakers were dealt with immediately, Serious top notch roleplaying, but it did have a flaw like some idiot either crashed their car, glitched it and caused a server crash or someone ddos the server after being banned.
As for donating benefits I liked how it stated what kind of packages were there such as:
$5 package - Physicgun / 2k ingame money
$10 package - physicgun / 5k ingame money / bigger car selection to buy from
ect....