When supercell comes out with the fully drawn 4.9mm, assuming it IS 4.9mm, it still only comes in deeps.
4.9mm plastic is available (in deeps only of course) from Dadant. I would not recommend it with unregressed bees. If you have them on PermaComb they will be partially regressed (about 5.15mm) so they might draw it all right. I had NO luck getting unregressed bees to draw it.http://www.dadant.com/catalog/product_info.php?products_id=622&osCsid=b856635a23435f5c9c94b939da3e08f9
I'd cut them in half and leave the gap. I used it in a Dadant deep hive and left the two inch gap at the bottom. Here's small cell wax cut in half and put in a medium: