Randy - 'sorry I haven't been back sooner to see your post. Yes, I plan on a cheek cowl. The flaps are covered with epoxy held silkspan. I felt that would resist warpage from the subsequent dope coats. It seems to have worked pretty well. I will cover the fuselage too, but I haven't decided on glass or silkspan. I've had good luck with the glass, since it takes less to fill, but it's a simple plane, made more complicated only by me. Ha! I took time from the club newsletter today to wet sand some of the wing. I found my 1/16" plywood for the doublers.
Yeah, the glass and epoxy is quite a bit better structurally than silkspan. However it is a bit heavier and tends to always bleed back to the surface in the sun. If finish isn't a main concern then the glass is better. In most cases however I feel that the silkspan is a little easier to use and is plenty strong enough for the purpose. The exceptions would be on a racer or a carrier plane for obvious reasons.
For this purpose either should be fine.