John,
Instead of using the lightbox that you are referring to in your post - just post a banner, maybe on the bottom of the page or top of your customer service page letting your customers know you are closed for x days and will process orders when you return.
I agree with Pam - by drawing their attention to the fact that you are "internet only" and closed would make most customers run to your competitors!
Another idea would be, to set up your email system to send an email, that your order would be processed in x days (when you return) this would not be waving the red flag that you are closed for business.
FYI - before I opened a retail store I did the banner on the site, letting customers know when I was away and also did the email letting them know, most customers were VERY understanding and not many canceled orders this way -- just my thoughts...
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