Cast iron griddle for top of double shoebox or riserless cook stove

Would it be reasonable to use a lodge cast iron griddle for a top on a riserless cookstove or a double shoebox, or would I be asking for trouble?  I also have a much larger cast griddle salvaged from a commercial propane cook range, must be 1/2” thick or more.  I want to make a small outdoor cook stove with the lodge cast griddle and if that works out well, then make a bigger one inside with the larger griddle top.  

I can't see any difference between using a glass top vs a cast iron top for your cooking needs as long as the same space is given for the gasses to flow below it. It may perform differently in terms of heat output and retention but function wise should be the same.