We took the sleeper off a 90 KW T600 and put a Daycab Company ( be sure and get the URL correct: http://www.daycabs.com ) kit in it.  The guys who did the job for us were just amazed by it.  They even included the drill bit to remove the old rivets!  Here is a quote from the Peterbuilt page of the Daycab Company web site:

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PETERBILT UNIBILT

One of our most popular kits, the Unibilt XL (fiberglass composite) allows seat travel to be the same as before sleeper removal.

We offer three different kits:
    • Unibilt flat panel aluminum
    • Unibilt big window aluminum
    • Unibilt XL fiberglass composite

In the Peterbilt line Daycab offers 8 different sleeper removal conversion options. Some traditional conversion parts are aluminum. Daycab Co. has never, and will never, use sheet metal. The XL is a fiberglass composite. The XL Unit has a gray sand-able gelcoat with a class A finish. Our engineers use only Peterbilt cab structural standards. Safety is always #1 here at Daycab Co.

Take note of roof height above door. See photos below. Unibilts have a 50" top to bottom (inside) opening. Unibilt-Ultracabs have a 60" top to bottom (inside) opening. Also check the badge on the side of the sleeper.

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The installation looks factory. The people were great to work with.  We had a glitch, the shipping company delivered our kit to a dealer a couple hundred miles away who had ordered one.  Everything was labeled correct, the shipping company just messed up and gave him ours as well!  Daycab Company called us and told us there was a problem then shipped us a new kit FedEx and told us if the other delivery was attempted to refuse it!

I also sold my old sleeper through their web site. As you can tell, I am a fan of the Daycab Company. 

Here it is after the sleeper was removed and kit installed before painting

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