I agree, a cowl is what I intended to do when I put mine together. BUT after a lot of thought. (I have been considering this for quite a while). I won't do it.
#1 you have to consider cooling. You don't want to overheat that aircooled motor.
#2 That 4 stroke motor doesn't look so bad in the wide open
#3 Get it in the air! You can modify it next winter,as long as there are no mishaps before then[]