I was looking at the chinook but wasn't sure if my quad motors would cope with the extra size, if I did it at same scale as the seaknight. I think it would if I can keep the weight down. The jet ranger ended up pretty light, the tail boom is quite spindly but the undercarriage is 30g. All my seaknight landing gear is 6g, 1/5th of the weight. If I make chinook landing gear same way, they should be around 8g. 22g is about 3 sheets of 1/32 x 4 x 18 inch balsa. I overbuilt the seaknight, but it means it is pretty durable. I have had it roll completely over with no damage. I have a list of helis that I want to build for quad motors.
Cobra
Skycrane
Chinook
I also have my hornet wasp to build, as soon as I am happy with my plans.