You don't have to use a whole chicken. If you are using cut pieces, chicken will be done in 25-30 minutes.
Chicken tandoori can be served with rice or roti.
Increase the amount of marinade based on the quantity of chicken you are using.
Try using the same marinade to make tandoori fish.
Sprinkle some chaat masala, squeeze some lemon juice on the tandoori before having. Raw onions and tomatoes goes well with this too.
You can make dry tandoori mix by mixing the dry ingredients of 2nd marinade and mixing it with wet ingredients whenever needed.
Vegetarians: you can pass the 1st marinade and apply the 2nd one on tofu and panner. Let it rest for 30min to an hour before grilling. Grilling will take only 10 minutes or less.