I have a F-22 made by someone else, I have no idea who now. It is a little smaller at 15 1/2" ws but weighs 61 grams without battery. I need a battery about 35 grams to balance it. AUW would be 95-100 grams. It is made of a printed smooth depron type material.
Somehow I don't think mine will fly very slowly, inside the only building I have available would be exciting or maybe terrifying I don't know which.
Looks like you have a nice little plane.