Emerald Fists Dreadnought Siege Shield

I've seen a few dreadnoughts with close combat weapons and shields and it inspired me to build my own.  I don't have a body to attach this to, but I'm going to put it in my bits box for a rainy day.  I sized it for a contemptor and styled it after boarding marines.

You can see a GW paint pot in the background for scale (about the same size) and it is curved slightly along the Y (vertical) axis.  I'd like to put a hammer probably from a dreadknight in the other hand.  I think it would be very siege/imperial fist like and fit in well with my Emerald Fists.