The fiberglass marsh boat that I have is of similar design, but with no oar locks, or floorboards.
It was made in Appleton, Wisconsin, not far from Lake Poygan.
Your vessel appears to adhere more to the wooden design, that the old time marsh gunners used to hunt ducks.
The stake holes are pure genius, as they hold the craft steady when need be.
I invert the extendable push pole. Place it in the stake hole, and drive it into the marsh bottom to secure and stabilize the craft. Then you can stand up if you like, and do what ya gotta do.
What you have there is a superior marsh boat, that can be hidden in very little vegetation, and natural settings. The rice reference may be due to it being used to hunt waterfowl in Wild Rice.
Once the decoys are set, the backboard is put in place, butt on a camo boat cushion, and camo netting over me as I lay down. Make a good gunning box to cradle your gun and hold shells, etc. It will also serve you well when jump shooting and dispatching cripples. Attach a line to your paddle handles, just in case you drop one in the water.
I have no idea who made your boat. From the photo's it looks like they did a very good job. You are gonna have a world of enjoyment with that vessel.
just my 2 cents
VP