I don't think this watch worth any modding. There's $10 DG-2813 inside, most probably, from Nanning factory, because GZ Dixmont DG-2813 visually is way better movement.
It's low beat, 21,600 bph, real Rolex has hi-beat mov't, 28,800, so, it's main giveaway. There's many other flaws, like crownguards, pearl, etc.
If you paid more, than $120 - you was robbed, mate.
And don't forget - there's no such a thing, as "waterproof replica". Need serious work to make it waterproof.