Ok so... assuming top/bottom timing is fine and inlet cam is out... make sure ex cam is aligned to timing mark as this will be "TDC" for cams and crank...
Using the image below as a guide, count off the 16 rollers marking 1 and 16 using something suitable like a paint pen or tipex...
Slot the inlet cam into the chain aligning the timing mark with the 16th roller you marked previously...
Place the inlet cam into the head, I normally do this with the tensioner 'out' (not bolted in) as its easier...
Fit two of the cam caps (I normally fit the ones marked 4 and 2)... torque bolts to spec (7/8nm from memory) and don't forget to wind the caps in a bit at a time to ensure the cam fits in straight
Check the ex cam timing mark is still aligned then undo the tensioner tool to release it...
Now wind the inlet cam back (turn towards the car from the front) to allow the tensioner and chain to rise to highest point...
If you have timed it correctly both the ex cam and inlet cam timing marks should align as well as the 16 roller marks you did previously
If they do you can fit the rest of the cam caps... don't forget the cam caps are marked 5,4,3,2 and 5 fits at the belt end of the head with 2 at the gearbox end
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