Nice CNC with Aliexpress i have nothing but good experience in build quality. Their offerings are often at the same or even higher level than other aftermarket brands.
However I look at the side cover as its own ''sacrifice part''. A part that is allowed to die to take one for the team.
I have done a lott of ADV riding in the past, there you see very strong stiff bashplates, rocksolid handguard etc etc. Often the effect of those over the top strong parts is that in a crash they remain intact. But the part they're bolted onto isn't. And that's a shame when that bashplate is connected to the engine casing of the frame.
Especially since, as i described, if this part starts leaking it will still get you home without too serious damage.
I think one of the best things you can come up with is damping like the bashplate of the Stark. The easy DIY would mean some thick rubber over the casing. Like from a ultra heavy duty tyre.
.
