It's been a while since you posted and nobody's replied yet...maybe you should check out MarkedbyTeachers.com, TSR's sister site. It has the largest library of essays in the UK.
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(Original post by dalek2009)
Would you be able to see whether I would pick up some marks at all?
I honestly can't say for sure.
I don't feel that you should get anything.
Your part A and part B doesn't really help you in this case. Does the bottom face belong to part A or part B in your mind?
That sort of approach would be OK for an area or a volume.
I think your best bet for surface area at this stage is to show that you have calculated the areas of all the faces (8 of them in this case) and added them up. That way you'll probably pick up working markings even if your final answer is incorrect.
You could write something like
Big rectangles: 6x8x2 = 96
Small rectangles: 3x8x4 = 96
L Shapes: (3x6+3x3) x2 = 54