Anytime, but it's all theoretical, many of these parts may not even be available for your buggy. Just do what you can and leave out what you can't. The biggest difference will be made by those tyres, if you only do one thing, it has to be that. As for the hubs, if they are really that different, then I suggest that you don't change the wheels, this may just cause problems. As for the shocks...dunno to be honest about the OFNA ones, the important thing is the uncompressed length of the shock should closely (but not necessarily exactly) match the length of your existing shocks. As for the diffs, well, a two speed normally eliminates the centre diff, but again, not necessarily...the front one-way will no doubt be tricky to find...but is the least important component (it is only for racing really), as you can always put heavyweight oil in it, to severely restrict diff movement.