| Hi Peter,
The idea I had is made from a simple series of straight long spars with a small notch at the required intervals in the top edge and to about 1/2 depth of the spar.
The cross spars are simply made the same but with the notches on the bottom edge where they would locate onto the notches on the long spars.
Ok you would have to make a few of them, but with some balsa strip & a fine square file...or a mini drill to speed things up a bit, you can do these easily.
Simply glue them together and you should have a strong grate...Obviously the outer edges of the whole assembly would be thicker as per your drawings.
Hope you get the idea.
Regards.....Mark
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