F-35 - Multi-Country Construction - Jump in Experimental Prototypes

I am not knowledgable about the technical aspects of this plane but have some suspicions. This latest production jet fighter has jumped a substantial number of prototype numeric catagories. Why? Also did you notice the large underbelly of this plane? I believe that it is NOT for engine but sophisticated electromagnetic equipment. Also notice that it is a multi-national build. Does anyone know the names of the countries and also is it a fact that it is the first time outside countries have worked within U.S. fighter skunkworks? Insights if any? Legalcatalyst.

Actually , many countries are `interested` the only one really helping is the `level 1` partner - the UK ; and im rather sure the companies involved from the UK have allready been to the *skunk works* before


Level 2 countries are The Netherlands and Italy , and level 3 countries are canada , denmark , norway , australia and turkey


Israel and singapore are foreign potential sales.


now , the different countries (level 1,2 and 3) have all put money down - but its not a comitment to buy - i think that Denmark will pull out , and so will Norway.

Question about nations can be answered by this:

www.jsf.mil...

Question about underbody is interesting, I never heeded it.