I've been thinking of kitbashing a Royal Sentinel for a while. Using green stuff to cover up the missile launcher is trivial, but I can't quite decide what I want to do for the Gauss Rifle in the left arm.
Considering that the Gauss Rifle is over 1/3 of the mass of the Mech, I was actually thinking of using the left arm of a Mad Cat Mk II, something totally out of proportion.
Does anyone else have any ideas?