Yes, your personal PD/ED do stack with your other defenses, so if you buy 30 PD armor, your natural 2 PD would also apply.1. Does ED stack with powers?
Example A: If I buy 30PD as a power for the armor, and my dood already has base 2PD. Does that stack and busts the cap? Or would that 30pd be whats used while I'm in armor thus ignoring my personal PD?
Unless you buy the armor's hand to hand attack or its strength with a Limitation that your personal strength does not add to it, then yes it does.Example B: If I have a personal 2d6 hth attack, and my armor has 4d6 hth attack, does that add to 6d6 as it adds to my current strength? Or would it default to the highest(4d6)?
There is a 1/4 Advantage that you can buy on your Flight of "Useable Underwater" that will give you that.3. Does flight work underwater in lieu of Swim?
I would go with one or the other, probably just the flight.4. Is it pointless to get both Flight and Leaping?
That depends on what it is. But it will not be something you can just go out and buy, even with a large amount of money - assuming you buy up your wealth.5. How difficult is it to obtain something with the "Difficult to obtain -1/4" limitation?
If you want, I can put some spit and polish on a sheet for you. I have no problem doing that.I have yet to do any final calculations on powers or anything yet.
Would you like to manage that part so that I don't "be ridiculous with my spending"?
You can allocate things appropriately within a build direction?