I'm back! Wyches & mordheim - The Keeper of Secrets

Sorry for the delay guys, I was caught up in the start of term frenzy at university. Everything is sorted now and I have finally found some time to set aside to relax and model.
I bought a set of dark eldar wyches, an empire scribe (I think from Mordheim) from ebay.
I have great plans!
I am going to convert him into an advisor for my inquisitor: the "keeper of secrets". His book and scrolls filled with the most revealing knowledge. His face will be hid behind a mask, emotionless, giving nothing away. He will also field as an Officer of the fleet in my imperial guard army.

I plan on using the head from the wych on the right of the box.

This is the model I will be using as the base

The Keeper of Secrets

This is my idea. I plan to remove the merchants head and will use it later as is full of character. I am going to replace it with the head of the wych. Add a scarf around the neck in green stuff. Add tubing from either side of the head, and then make a respirator on the model's back out of the venting from a space marine backpack. I am unsure if I should add a holstered gun or auspex at his waist.

I plan to paint his visor gloss black, the neck scarf dark red and his tunic an emerald blue with light dust weathering around the base.

~M