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I've been asked this before, and I'd have to say it would be nearly impossible to get it done right. There is a lot of geometry involved in the angles and distances of the mirrors and the optics. Anything can be done, but it would have to be a situation where you did it for a hobby, and plan to spend PLENTY of time on it.
If it's a "removable chassis" model, which includes all RCA-GE-ProScan projection sets from the early 90s & up, and most Sonys late 90s & up, at least all you need to do is position the single rear mirror. Bear in mind, however, that there isn't any way to shrink or enlarge the picture. The foal length of the projection tube/lens ass'y is deisgned for an exact screen size, so you can't focus it on any other size without either missing the edges of the picture, or having a picture smaller than the screen.
Now if the question were posed from the opposite (someone's getting a nice cabinet and wishes to install a projection TV in it), that's easier... Just buy an LCD graphics projector and install it with reverse picture, and aim it at the inside of the screen. Those are designed to focus on just about any screen size, and they have keystone adjustments so you don't need to have the projector aimed dead-on at the screen and can still have a good congruent picture.
In your case, I'd just build a nice outer cabinet, and install the entire HD set, case and all, into the new cabinet without disturbing anything.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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