Just ripped the floor up.

VIC - just saw the pics and it looks like you are doin a right thorough job. :) While you are waiting for the seacast to arrive you should use the time to make sure you get as much of the wood out as you can - because the seacast will not bond to wood. Maybe use a long sawzall blade to scrape the insides of the glass - just be carefull you don't poke a hole thru the bottom. The cleaner the glass surfaces are - the better your seacast bond will be. Think of it like it was under a magnifying glass. When you are satisfied that the wood is gone - clean the surfaces with rags wet with acetone.