Brick-built alternative to "Door 2 x 5 x 5 Swivel, Bracket Base" I am trying to make a brick-built alternative to the swivelling door piece that's frequently used to provide secret entrances in castle sets.

Example: this combination (images from Bricklink)




The pre-fab Lego piece has several advantages but is also fairly ugly for use in builds that don't rely on panels for walls. Its main advantage though is that it is compact and swivels around the centre, which is possible because the inner piece is very thin and slightly narrower than the outer piece. 

I have achieved a similar pattern using the 2x2 turntable tile but getting the turntable positioned under the wall so that the wall spins on its centre means I need to use two levels of jumpers, both at the top and bottom of the wall. This consumes a lot of vertical space and also juts out horizontally at the top (Why doesn't Lego have an inverse jumper? one stud-hole on the bottom, two studs on top?)

Here are pictures of my creation. I'd appreciate any tips on how to make it more compact.
Note that the round 1x1 bricks are needed on the sides to make enough room for it to swivel. It still rubs a bit but it's fine.







The first layer of jumpers offsets the turntable so that the wall spins on its central axis. The second set of jumpers allows the wall  to be centered over the turntable. On top, I have to hang the jumpers out, then repeat with the turntable and then more jumpers. In this prototype the dark grey layers are jumpers and the black layers are turntables.
Why not use just two jumper plates (3794), one on the top and one on the bottom? No more additional are pieces required.







You can also replace the stack of 1x1 round bricks with a single Support 1 x 1 x 6 Solid Pillar (43888) piece. The piece is used in conjunction with a large swinging vault door in the Bank &amp; Money Transfer (3661) set. The brick is stronger then a stack of 1x1 round bricks and the round part of the brick (at five bricks high) is tall enough for most minifigures.