The phrase "a rather vast" is correct and usable in written English.
It can be used to describe something that is extensive or large in size or scope, often in a more nuanced or subjective manner.
Example: "The library contains a rather vast collection of rare manuscripts that span several centuries."
Alternatives: "a quite extensive" or "a fairly large".
Though it seems that the differences between a small boarding school and a small liberal arts college must be limited, they are indeed rather vast.
Moreover, there are some works on beamforming design for special types of AF MIMO relays; for instance, the authors in [10] considered codebook design for half-duplex AF MIMO relays, while the author in [11] considered beamforming design for rather vast types of MIMO relays.
But the difference between the speed at which physical laws of nature mandate your destruction and the ability to go anywhere near that fast is rather vast.
Jesse, a paleontologist and now-retired university vice president, is the only living member of my rather vast Red-State clan of cousins with whom I have anything truly in common.
Over four months ago, just after the Paris horror show, I discussed a number of things that any serious ongoing student of national security affairs would identify as priorities for Obama and his rather vast National Security Council apparat as it takes on Isis.
The wide-eyed, non-verbal little cave orphan is actually kind of sweet, so with him in tow, Arlo's journey becomes a Western -- a rather quiet one that plies vast terrain.
Over the years, though, it has repeatedly had to be jury-rigged in the face of new difficulties, so that it has become a Rube Goldberg machine — or, rather, a vast landscape of them.
Daoud's work is not simply a riff on the French canon, but rather a vast and searching allegory of the conquest of a people.
Unlike most academic pursuits, I was not limited to a small field of endeavor but rather a vast field of clinical medicine.
In general, interviewees had obtained a rather low level of education (the vast majority had primary school only), and few of them had previous or current employment.
