Have you researched the spoke lengths needed for the replacement hubs? can you build wheels? can you get get replacement pads for the calipers? Looking a the conversion kit, it's has very low end parts, the instructions not that it has 28/36 hole hubs (guessing you probably have 32H hubs), but misses measuring the spoke length which is different for every rim/hub combination.

For the stresses that #canker mentions, would be more concerned about fitting the adapters to the bike, the front is designed for a rigid fork, stock your Moab has RS Judys (which may already have a mount, but are far too big in leg diameter for the adapter to fit), not seeing the rear as just an issue, but it all depends on how it fit s the frame (still looks ugly,a and personally wouldn't touch one).

Would also go with sticking with v-brakes for your bike, as a far better option that the conversion, if you really wanted to convert your frame for a limited budget, would look at a good set of 2nd disc wheels, and A2Z adapters (if they fit), these are better, although none are as good as just getting a frame/forks designed for discs in the first place.