Building Upon Risk

I am a big fan of the Board Game Risk, as is my family and a lot of my friends. But I feel it's starting to get a little bit "stale" now, and it's based too much on luck and what not, and I could sit here and point out all it's flaws, but you get the idea.

I am wanting to make a "new Risk", but add my own twist to it, if that makes sense, and I have quite a few ideas, but I need help sorting through the good ones and the bad ones, and of course I am always looking for new ideas to add to my own.

Basically what I have so far is that instead of territories, the map is split into three categories: Capital Cities (eg. Washington D.C, London, Tokyo, Ottawa, Moscow, Beijing, etc.), other Cities (eg. Perth, Vancouver, Johannesburg, Los Angeles, Buenos Aires, etc.) and empty territories (spaces without a city). There are also more "spaces" than the original 42, and the regions (from largest to smallest in terms of territories) has changed to North America (12), Asia (11), Africa (7), Europe (7), Oceania (6) and South America (4). I may add more if I see fit though.

The basic premise of the game remains the same. You get reinforcements at the start of each turn basd upon the amount of land you own, with bonuses being awarded for each region you own. However, this is where it changes...

There are no more cards, instead you are given money to build your army. And you aren't limited to troops. You can also build artillery (tanks, barges/armoured transports and AA guns), an airforce (fighters, bombers and transports) and a navy (battleships, submarines and Aircraft Carriers). Each of these obviously have their advantages and drawbacks, and can go a long way to aid your war effort if used effectively.

Obviously the navy implies that you can now take the battle to the seas, and that in order to travel between continents and between islands. You can also use artillery (in particular tanks) to improve your chances in battle. I'm not sure whether to keep the same fighting mechanic as in original risk, in which case tanks add to your dice roll, or give you an 8 sided dice or something, or to implement an entirely new combat system (suggestions?)

You can also go for bombing runs using your airforce. I'm unsure whether to keep this or not, because I love the idea of being able to bomb your enemy, but I'm unsure how to implement it into a game like this. How does it work, can it just rip right through your enemies forces? How many territories can you bomb over? How much damage does it do? etc.

The other "innovation" to the game I want to make is the use of buildings. You can now construct buildings on territories to improve your army. You can build cities (on territories that are city spaces) to gain economic bonuses, colonies to spawn extra troops, and docks, airbases and factories to enable the construction of ships, planes and artillery respectively.

You can buy military officers to enhance your chances of victory:
Lieutenant -- Captain -- Commodore -- Admiral or
Lieutenant -- Captain -- Colonel -- General or
Lieutenant -- Captain -- Colonel -- Air Marshal

Each time you promote your officer(s) (which costs a lot of money, and the idea is that you're unable to reach the higher ranked officers until later in the game), your army is enhanced. For example, Lieutenant is allowed an 8 sided dice, Captain give an 8 sided dice to himself and every other man in his attacking force (eg. if you attack a territory with 3 men [with one being the captain] you get 3 8 sided dice). The Commodore gives an advantage to the ship he occupies, and the admiral gives the same advantage to all ships you have on the board (same for general with artillery and air marshal with planes).

I also had the idea of being able to buy politicians to "spread your influence" but I'm unsure how/if it's possible to implement something like this in this game. If you can, then I also had the idea of being able to build a "Capitol" (on a Capital City territory) which spawns a King, having a similar advantage to a politician.
Not too sure about it though...

So any thoughts and suggestions are welcomed. Is the idea even any good. Please be harsh (to a reasonable extent). I'm not gonna bother if it seems like a bad idea. Also, sorry for such a long post, but there's a lot going on in my head.

Thanks a lot,
-Matt