I have not built a tank from scratch, but I have rebuilt tanks to be front opening and made tracks from 1/4 inch aluminum U's you can buy at Home depot or Ace. I used 1/4 inch glass for the front and added a felt strip to the bottom of the U to make it slide better. Just another idea. You can see a couple pics in my gallery:
http://dendroboard.com/coppermine/displayimage.php?album=lastup&cat=10529&pos=0[/url]
http://dendroboard.com/coppermine/displayimage.php?album=lastup&cat=10529&pos=0[/url]
