So long as you don't engage in the unauthorized practice of law, no.
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Lots of companies offer these services for lawyers. The company that designed and hosts my web site deals exclusivley with lawyers (I think).
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Its dont by countless of others. Just like any other business, you just need good business and legal advice to get you going, and have professionals around you to help when needed. Since you will be doing this for lawyers, presumably you knows some already ? I'd find a busines lawyer and start talking about the logistics.
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Lots of legal issues. Potential copyright infringement (see his other comments - he intends to copy existing websites), trademark infringement (ditto and copying existing sites opens up "trade dress" issues), and patent infringement (some websites likely have patented methods employed on their website). There are domain name legal issues. I think unauthorized practice is one of the minor worries, as presumably the law firms will have lawyers who are authorized.
Also business issues. There are at least a thousand vendors doing the same thing, and at around your price. But, if you are good there are law firms that will barter legal work for website work.
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