Pretty good setup, decently balanced and good cost-effectiveness.

I do want to ask though - why water cooling? Based on my understanding, your setup does not produce enough heat to really require watercooling (unless you really want sub-50C under load). My understanding is that a decent tower cooler is much more reliable and nearly as effective as a 240mm AIO.

Regardless, I don't necessarily even think you need a tower cooler - I have an R5 5600 and RX 6800 combo in a sub-10 L case (Geeek A50 Plus), and I'm cooling it just fine with a small-form-factor cooler (ID-Cooling IS-55). Actually, I got by just fine with my stock cooler (Wraith Stealth), I just upgraded because there was a good deal on the IS-55 cooler.

I think the 5700G comes with the same Wraith Stealth stock cooler, so I think it could be worth trying out the stock cooler first before you pull the plug and buy a 3rd-party cooler. Even if you're not satisfied with it, at least it'll give you a frame of reference for how much better you want your cooler to be. After all, you could always just replace the cooler any time if you're not happy with it