Minecraft - Minecart Roulette Wheel

Roulette Wheel

Size
Width: 13
Depth: 13
Height: 7 (not counting entirely solid bottom layer)

Materials
non-descript internal solid (X): 169 (possibly some less)
visible solid base (1): 132 (+4 optional)
visible solid center spire (2): 4
redstone torches (T): 15
block of redstone (B): 1
redstone dust (R): 15
sticky piston (s): 1
lever (L): 1
button (b): 1
lights like torches or glowstone (l): 4
normal rails (N): 68
powered rails (P): 7
dispenser (D): 1
red wool block (r): 23
black wool block (b): 23
green wool block (g): 2
sign (S): 1 (optional)

Blueprints
layers are listed from bottom to top, with the uppermost side being north (due to how rail turning works, this is very important)
Periods not part of the map border represent air, but logically connect something an adjacent layer (like multi-layer redstone circuitry)

Layer 1
.......V.......
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXRXXXXXX.
.XXXXXXTXXXXXX.
>XXXXXXXTRXXXX<
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.XXXXXXXXXXXXX.
.......^.......
redstore torches are attached to side of center block, forming two NOT gates

Layer 2
.......V.......
.             .
.             .
.         T   .
. TT    TXT   .
.  XRR.  R    .
.  T  .  R    .
>    RRR..    <
.    R R  T   .
.    R RRRX   .
.   TXT   TT  .
.   T         .
.             .
.             .
.......^.......
When two redstone torches are next to each other, the one next to an X is attached to the side of that X

Layer 3
.......V.......
.    11111    .  5
.  111111111  .  9
. 11111l11111 . 10
. 11111111111 . 11
.1111111111111. 13
.11111   11111. 10
>11l11   11l11<  8
.11111   11111. 10
.1111111111111. 13
. 11111111111 . 11
. 11111l11111 . 10
.  111111111  .  9
.    11111    .  5
.......^.......
The l blocks should be solid light-emitting blocks. If torches are used, instead replace l's with 1's and place torches on top of them on layer 4

Layer 4
.......V.......
.    brgbr    .
.  rbr   brb  .
. rb      Prb .
. bPNNNNPNN r .
.br N     N br.
.r  P2111 N  b.
>b  NN1B1 N  r<
.r  NN111 P  b.
.br NN    N br.
. b NNPNNNNPr .
. rbP      rb .
.  rbr   brb  .
.    brgbr    .
.......^.......
Circle of rails (with four powered rails) connecting to powered rails leading up must form a loop when the lever is up. Powered rails leading out of loop must slant up to connect to rails on layer 5

Layer 5
.......V.......
.    NNNNN    .
.  NNN   NNN  .
. NN       NN .
. N         N .
.NN         NN.
.N   N2      N.
>N   . s     N<
.N   . L     N.
.NN  .      NN.
. N         N .
. NN       NN .
.  NNN   NNN  .
.    NNNNN    .
.......^.......
Sticky piston faces down to grip the block of redstone

Layer 6
.......V.......
.             .
.             .
.             .
.             .
.             .
.    .N2T     .
>      2      <
.      S      .
.             .
.             .
.             .
.             .
.             .
.......^.......
Redstone torch attached to side of 2 block

Layer 7
.......V.......
.             .
.             .
.             .
.             .
.             .
.     .P2     .
>      D      <
.      b      .
.             .
.             .
.             .
.             .
.             .
.......^.......
Dispenser idealy includes: 3 minecarts, 3 minecarts with chests, 3 minecarts with hoppers


Operation
1. Operator stands at the center spire next to lever and button. Give the lever a couple flips to make sure the track is oriented properly, but be sure it is in the up position afterwards.
2. Wait until all bets have taken place (if any).
3. Press button to release minecart.
* The minecart will begin to endlessly circle the inner track.
4. Once sufficent drama has been built up, pull the lever.
* Minecart will move onto outer track, above the wool blocks.
5. When minecart appears to slow, follow it from inside the tracks WITHOUT TOUCHING IT.
6. When it stops, call out the color the cart has stopped on. If ambiguous, fudge it so the House profits the most.
7. Return minecart to dispenser and lever to the up position.

Customization Notes
*The exact materials that make up X, 1, and 2 do not matter so long as they are solid and (in the case of X) can pass a redstone charge
*Orientation of center spire (inside inner track loop) may be rotated in 90 degree intervals to deliver the cart from different angles
*Blocks may be placed on top of the center spire, including above the powered rail, without affecting minecart delivery