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Grey knight terminator armour might be worth considering as a base for the conversion. The shape is similar but with less enclosed look.
This can be altered to be more enclosed. The writing on their armour can be filled in with gs if it is undesired.
You could even attempt to cut away a portion of their torso under each arm to add the underlying cables. Don't be afraid to cut up flat surfaces or simpler details on your model during the conversion process. Any unintended damage can be easily hidden or repaired with GS. just be cautious around finer details (unless you don't mind spending ages fixing it up )
With the pauldrons you could double up termi-pads on top of PA-pads to increase thickness and size.
However, PA-pads will not fit termi-arms and some cut/file may need to take place for this idea to work.

Hope this helps

Peace