Update: Just got back from the SC today. Went for test drive with the foreman and managed to replicate the knocking 'kruk' sound when going over bumps. I also complained about thin roof very noisy during heavy rain. Outcome is - they believe the front lower arm is the culprit for the knocking sound. They will order the front lower arm for the knocking sound and also 'roof silencer' for the noisy roof (I believe this must be some insulation material). Once the parts arrive, they will arrange for appointment, but I would need to leave the car there for 1-2 days to fix these 2 issues..... Hopefully they know what they are doing... 

Actually i forgot to ask clearly. The actual knocking sound was from upper engine mounting or top/upper absorber mounting? As i knew,dugong experienced knocking sound which from top/upper absorber mounting there. Hmmm............