can you explain the reason of a 100Ohm on th blanking signal? I always used a 75 one. Also plz tell me why you put resistors on the three colors, since I always saw (on commercial cables like those of PSX, PS2) capacitors instead.
The RGB output level of the MD/Genesis is very high, and can result in a very bright (or even distorted) picture on a normal European TV with RGB SCART input. The resistors are there to reduce the RGB signal voltages to within standard SCART tolerances.
The reason for including capacitors is to filter out a DC offset on the outputs. In the case of the MD there isn't a DC offset, so there's no need for the caps.
The value of the resistor on pin 16 isn't too important - anything from 75 to 300 ohms should be OK.