Tigerdude,
Ok, as far as the bottom of the wing. Yes you do want to "bevel" it off. Remember, this is a flat bottom wing and they way you have it will leave a "bump" in the covering at the wingtip. You want a nice flat transition into the wing tip.

As for the gap, it's hard for me to tell from you pictures. If you can wait until tomorrow I'll have the wing panel on my build off the table where I can do the wing tip also. I should be able to get you an answer as soon as I can see how it all goes together. Sorry that I can't be any more help right now.

Ken