I'm building two FN5 turrets at 1:4.5 scale. Each has:
A 12v/10w grain of wheat bulb - always on, operating at 12v
2 x 12v/5w grain of rice bulb - always on, one operating at 12v, the other at 4.5v
1 x 12v/5w grain of rice bulb, always on, operating at 9v.
3 12v/5w grain of rice bulbs, occasionally on, not more than 1/3 at a time, at 12v.
A 6v DC motor (possibly 2) of unknown wattage (https://www.faulhaber.com/fileadmin/Import/Media/EN_0615_S_FMM.pdf) to operate at 4.5v. This will drive a lead-screw/nut to elevate and depress the gun-cradle. Turret traverse will not be wired into this area.
Also entering the box will (presumeably) be 2 cables from the receiver to the motor, which is in effect a home-made servo.
Electronics are not my area of expertise at all. My intention is to run 5 cables from the top of the turret to the port ammunition box, with supplies of 12v, 9v, 4.5v and 3v, and a common earth, with a structure within the box containing little brass bus-bars ( a stock bar size from from K and S metals I would think) into which wiring from these various lamps and motors can draw current, with each protected by a TR5 fuse rated to circa 130% of the normal current draw for each service, perhaps mounted on a small PCB. The fuses I'm looking at are http://www.littelfuse.com/products/fuses/axial-radial-thru-hole-fuses/tr5-fuses.aspx.
If someone could let me know if I'm on the right lines, or if there's a more elegant way of achieving the same ends, I'd be most grateful. The volume into which everything would need to go is a box of 89x97x19 mm. A step-file of the precise volume is available on request. Any help most gratefully received!