Here are some blue prints.
Here are some foot notes for them.
1.screen
2.joystick
3.d-pad
4.start
5.b
6.a
7.c-up
8.c-right
9.c-down
10.c-left
11.volume slider
12.contrast down
13.contrast up
14.charging port
15.wall power port
16.screen on and off switch
17.off, wall power, battery power switch
18.internal screen, AV out, or S-video out switch
19.S-video port
20.head phone jack
21.AV port
22.gamboy/gamboy color slot (transfer pack)
23.rumble pack, memory pack, or transfer pack
24.internal or external player on controls
25.external controllers port
26.L
27.Z
28.R
29.game cart slot
30.game cart cover (flips over the cartridge)
31.game cart