[as + adjective or adverb + as] is the right construction.
You may even put a noun inbetween. In such a case, there should be an adjective that goes with the noun. If you want to build a sentence based on this pattern, there is one thing you should keep in mind. That is, be careful with the position of the article 'a/an.'
ex: Tom is [as tall a boy] as Bill.