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Turtle a couple of things.
1. Please don't make spam posts in multiple threads identically.
2. The volume needed to get a large amount of lift is enourmous. To get an aluminium skin the size of an airship with usuable lift would be enourmous and heavy in and of itself with fairly significant chalenges in having the skin sections joined gasstight. That volume of metal is also not really inexpensive, and would need support other than that of the gass to support itsown weight because gass under huge pressure to expand the skin doesn't provide much lift.
3. Having a number of serious leaks probably won't result in the instantanious destruction of the aircraft but would be expensive to repair as the airtightness is nessacary to the airworthyness of the aircraft unless you are putting internal bags within a hull in which case to have much serious lift you are once again talking about a truely huge structure having that be a source of lift as well might be interesting and usuable but making it armoured against even fairly light weapons like 7.62 rounds would require tremendous weight.
I simply see far more potential as fast fairly cheap commercial transport than as a military aircraft. The biggest hurdle to millitary aplications beyond observation is the volume to lift ratio makes them by nessecity large and large things are hard to manuver.
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