Round the corners?
Jorge,
You'll likely get answers ranging from a) no rounding necessary to z) round and smooth EVERYTHING...
My opinion and what I did was smooth the edges with a small fine file, round the corners slightly with same file, and buff down the edges that contact the skins as it appears you have done. This way you have no points or sharp edges that would concentrate pressure against the skins.
Then again, I've been told that I'm overthinking this and making it waaaay to much work. Hey, it's my baby and I'm enjoying the build.
Enjoy yours and best of luck!
When I get the feeling that I'm stressing too much about such details, I remind myself of the guy who (reported here on VAF) asked Van's a question and was told something like "It's a truck! Build and go fly it!".
And whatever you do, don't ask about primer! <grin>
Dave
Kit #121, Emp, Fuse, Wings, and Finish kits done. Engine to come soon.