This is an intermediate/expert build. If you already have the Juggernaut constructed, this is going to be easier as Synergy II is basically a hugely modified version of it.
You can make "Little Brother" from Steps 2, 3, 6 and 7 if you really want it.
Step 1: Continued Introduction
If you watched the Scout203a video, you will have noticed that the door broke. This is because the brackets that held it on were situated near the ground. This made the susceptible to breaking.
Also, the turret now has a rotation lock. In step 6, you will be given the option to lock the turret, i.e stop it rotating. This is good of yo want this as a toy to pull around, because it is a lot stronger with a more stable centre of gravity. However, you can choose to skip step 6 if you wish. If you want minor rotation, as in roughly 30 degrees, then you can opt for high side armour, which stops the turret rotating beyond them. If you want full 360 degree rotation, you must skip step six and choose the smaller side armour (the yellower one) out of the two examples given in step 3.
Step 2: Turrets
Step 3: Rear Section
Can't see image notes on picture 1? Press F5.
With pictures 5 and 6, you can choose which panel you want.
Step 4: Front Section
Once again, this is just a bunch of pictures, so you may struggle with this step if you are inexperienced.
Picture 2 is good reference for picture 4 and 5.
Step 5: Attach the Two Halves
Step 6: Turret Locks
Step 7: Finishing Note