Absolutely, a fowler is a very straight forward build. with nice long lines to duplicate w/o tricky architecture such as on some schools of building. As stated start with a average piece of wood readily available. (Allen Martin was recently selling some and will likely have more stashed) If you do not want to try inletting the barrel there are a number of people who will inlet your barrel into your wood for you. If you are looking at duck and turkey hunting you might want to consider having your barrel jug choked. One other thing, duck hunting usually involves "non toxic" shot that is hard on muzzle loader steel barrels, just a consideration. A good early Ketland lock or Round face Virginia lock would be appropriate. Smart Dog has posted some extremely good information on building a correct fowler. an English style architecture that has a nice straight comb would handle heavy loads the best, so something to consider.
If you make mistakes do not become discouraged , a lot of building is correcting mistakes and making things work. I doubt that there are many guns built that do not have a mistake or two that were corrected. So, have at it and enjoy the ride, caution it becomes addictive...I have been at it since the 1960s and have not been cured yet... Ron