as metal cage worked for Russians tanks against javelin in Ukraine
the idea of gathering all your air asset in 4-5 under mountain base is absurd and you think how these bombs come toward target , they can come from top , they can come from forward . just look at some video of their test in youtube , they are not free fall bomb which only have one mode of attack.
the only feasible way of protecting your asset against first strike is distributing them in various bases around the country and its the only way for Iran to operate its air force as it gonna be mainly consisted of Kowsar and its variants in future its the only way to overcome the range problem of the fighter
who said out in the open , I say out in shelters , I rather instead of puting them in 5 place put them in 50 or 60 or even 100 place
Protecting in peace time is harder than protecting in war as in war you expect the attack and in peace time you don't expect the attack .
about your question first don't store your equipment in building suitable for workshops , and then as i said disperse them don't put all your egg in one basket
not steel door around it is enough , the change in the shape of the area , the torsion on the door make that entrance unusable for more than some hours
and go fix that enterance easily if you can
and about your metal fence idea , see how it will work , just a mere BLU-109
or what GBU-27 can do , its a GBU-24 put in the body of a blu-109 penetrating bomb . and its how GBU-24 work
end I mentioned another valid tactic that was designed to protect Sweden airforce against USSR attack and now the program being activated to counter Russia hypothetical attack , wonder which tactic is more useful for us . by the way can you tell me when those base were built
if you see any , beside that prototype that were shown 3 years ago please inform us.
IRIAF decided to go with Kowsar as Yasin was underperforming compared to it and we certainly don't have nor money and neither resource to invest in two production line for two airplane that are in same class and have the exact same capabilities.