Consider using light PCV pipe for the egg laying, and/or the corrugated plastic sheet that cheap signs are made of. Both are light and I have seen other's success with regards to holding eggs (in aquariums). As far as size of either, I'd try items that are at least a foot long (or a foot square) an no more than 3 foot.
A male FHM tries to lay claim to an area that is about 18" square whenever possible.
