My stepson just finished a four year enlistment in the Air Force. He bought a new Ram Prostar van that he's converting to an rv of sorts. He's going to do some traveling before resuming his college education at San Francisco Univ next fall. He wants to put a hatch on the roof like the ones we have on the deck of the bow. I can find some, but he wants the retracting screen and blackout shade. Any ideas on a place to find one of these?