anyone used r.v. woodcraft plastic floor grills

im looking at putting floor grills down in stock loft and possibly in my racing loft, was thinking of making some out of 2"x2" and wire mesh, but then i looked at r v woodcrafts they do a plastic 1 all locks together is 19 3/4" x 19 3/4" for £7.95 thats like 40"x40" for £15 just thought that wasnt a bad price to pay, what do you reckon guys?