Looks like a real nice project russ and you seem to be doing a great job with it! To sand the glue off the sides of the squares try putting the sandpaper on a smooth level surface like a desktop and then gently work the squares edge against the paper... It'll keep the edge true and make for a nicer joint when you reglue.
If you decide to make another one let me know. I have a couple ideas for you to add some nice little touches with very little extra effort.
[b][color=#FF0000]If your brain is part of the process, you're missing it. You should play like a drowning man, struggling to reach shore. If you can trap that feeling, then you have something.
[/color][/b] [b]Peace of mind. That's my piece of mind...[/b]