The phrase "a prototype of what" is correct and usable in written English.
It can be used when discussing an example or model that represents a particular concept, idea, or category.
Example: "The new smartphone design serves as a prototype of what future devices could look like in terms of functionality and aesthetics."
Alternatives: "a model of what" or "an example of what".
They gave me a model, a prototype of what a marriage could be: strong, happy, equal.
It's a prototype of what IDEO calls "smart meal technology"— where kids can pre-order meals in the morning that they will eat later in the day.
Six years later he approached Williams and Stone with his idea; together they developed a prototype of what would become the Twitter platform.
They wore an unconventional assortment of night-vision goggles, miniature computers and communications gear, a prototype of what the Army calls its Land Warrior system.
A Scope for SETI Astronomers involved in the search for extraterrestrial intelligence have unveiled a prototype of what they hope will be a dedicated SETI radiotelescope.
Italian catalyst manufacturer Acta SpA has launched a prototype of what it claims is the world's first platinum-free disposable fuel cell.
As first reported by Forbes.com (See "The Week Ahead: Sept. 9-13″), Intel will demonstrate a working prototype of what it calls a "Personal Video Player" at the Intel Developer Forum (IDF) today.
He added: "In the space of three months, a digital team, mostly people from DWP, produced a working prototype of what everyone agrees is the long-term strategic answer, a digital application and that's continuing to be developed now".
Right now, the company has a hacked-together working prototype and a design prototype of what it hopes the product will look like in its final form.
Astronomers have produced a small prototype of what could one day become a telescope with almost unimaginable resolution.
It's still just a crude prototype of what it could be.
