Certain forms of AdjP occur right at the beginning of the NP, before the indefinite article a.
a. [How big a box] do we need?
b. We'd select [this big a box].
a. It seemed [such a computer].
b. [What a handsome] I was.
- virtual disaster *his almost death
- It virtually evaporated. He almost died.
- It was virtually impossible. He was