Osprey,
Nice looking gun, but you're right, a little thick in the forearm, forestock area. The way to cure this is to make the web between the barrel channel, and ramrod channel thinner. On a straight oct barrel, this is quite easy. You only need about an 1/8 to 3/16 web. You'd be surprised how much that will slim down the overall appearance.
Set triggers can be tricky when you thin them down that much, but a well tuned lock, and a properly pinned trigger work very well.