Greeting Vault Tec, Overseer here,
Under normal conditions a Vault is generally fitted with a Boulder Breaker 486 to deal with those troublesome rocks and assist with expansion. However, it seems that out vault was not equip with a BB 486. It seems that the shipment never arrived upon stocking the vault.
We are not troubled though as we have been expanding without the aid of a BB 486 as you can see.
http://imgur.com/s1lhZbr
We would however like to request some advanced Vault Tec Hallways to fit between rooms instead of more elevators. We have seen stock images of other more advanced vaults and they look astheticly more pleasing.
Such as these.
https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTcoPPRz1oz9sL07NfYtyjVAHt2NwOOpiIzo5h2Rv3IJEYhws0Y0uWJKJWo
https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcThuWRQERKo2ZwYP0qcsuiXxpi4M3ODJotk0vJlvfG41olxTOSW
Those sorts of things would be good to bridge between the elevators where a full room may not fit.
Thanks again for allowing us to survive the fallout.
TL;DR
Let us build hallways between rooms instead of more elevators to save on cost and to make more vault themed style.
I like to not destroy any rocks. It's harder that way.
486 spells gun on key pad.