A literary review by a respected British journalist and obituary writer of an official biography of Britain's Queen Mother and published yesterday in London's main evening newspaper, began with this paragraph:

The threat facing all royal biographers is that they will end up producing not so much a book as constructing a literary mausoleum.

I'm not impressed. The above sentence appears to have a fundamental flaw. Either one word should be moved or another deleted. Does anyone else agree? Can you explain what is wrong?