It's EASY to make an elliptical Primestar dish into a multi-satellite multi-lnb Skewable dish. Just mount a BOAT SEAT swivel base between the dish and the mount! You only have to slightly enlarge the boat seat swivel holes, as it almost bolts right up as it is. You'll have to rig someway to lock the dish at the setting you want. I just drill a hole through both plates after adjusting where I want it, and use a self-tapping screw to lock them together.
Cabela's -- Swivel Seat Mounting Base
Then, you just add lnb's as needed, (use a piece of 1/2" or 3/4" electrical EMT tubing on the lnb arm, and mount the lnb's along it's length as needed) aim it at the sat you want with the strongest signal as the center sat, and then skew it to match the sat arc to bring in the sats to the left and right of it. Don't forget, the sat signals will cross over to the opposite lnb. Just like a Dish500, but better!
Of course, with multiple dishes, you can just use separate dishes, for each sat. Much better signal that way.
Great Idea!