Just my 2 cents worth, I don't agree that the 110 would represent a night fighter better then the P-61. When you see a P-61 you know it's a night fighter period. When you see the 110 you see several different types of planes, fighter, fighter bomber, recon, fast bomber, nightfighter, glider tug etc etc.
Perhaps have the P-61 for a the Night Fighter and save the 110 for the "Focke Wulfs Messerschmitts" build? Or if a German Plane is prefered how about the He 219?