Thanks for your thoughts fellas, like a lot of these sunfish conversion ideas, the hull is free and I have enough fiberglass, epoxy resin and lumber laying around from previous projects but not enough to build a whole boat, so it really comes down to making something useful out of what I have. I've built a couple of Kara Hummers, which I foolishly sold so I'm sure I could manage a ply on frame or stitch and glue pirogue type craft, Uncle Johns bayou skiff comes to mind.
As far as the hunting conditions, this would probably be an extreme high/king tide pursuit. The few guys I talk to that chase them seem pretty set that its a lot of work for not much reward on a normal high tide. Our mid elevation marsh where the tide reaches daily provides a lot of cover for the birds, and I would imagine tough poling in whatever you are pushing. When the tide covers up the lower marsh and reaches the high marsh which is less densely vegetated the birds are consolidate in less cover and are more accessible. The seasons are typically structured around the highest tides as well. That and we are fortunate to have plenty of opportunity in this part of the world with Doves, Quail, Woodcock, Snipe and Ducks throughout the fall and winter so if the tide isn't right conditions are probably favorable for something else.
Lets just say that I am going to do it, what do you think the most important deficiencies to address are? I'm 5'10, 175# so another hunter and a dog (42# GSP) should be within the capacity of the hull, gear would be limited to guns shells and a small cooler. Ive heard of folks shooting from the bow while seated to compensate for lack of stability and or lack of skill. Foam would be added fore and aft in sealed compartments to prevent her from going all the way under if swamped. Some method of runners/keel to prevent it from spinning while pushing. What else do you think?