Ed,
Bill Vining has increased the beam on his HT to around 9', and has cautioned against going wider. I agree with others that wings add weight that's a disadvantage in all but big wind conditions. Good for recreational comfort though. I also agree that bow bouyancy is limited, so any increase in beam(or wings) is going to make it more tenative to drive hard downwind in a blow. It's also a lightweight boat, and any of these changes will increase the loads on the rig and platform, possibly beyond what these structures are designed to take. My advice is to sail the boat a year or two before doing any such mods. Bill's rear beam lift is pretty desirable for this boat.

Dave
F18HT
Stealth F16
ARC 22
Flight Risk