nice idea..
did something similar. Ive done a run and grown my mums out in smart pots (#3-5) with 100% coco coir and fell in love. But always preferred the beds when it came down to flowering. So i got thinking, and converted all my soma beds into "smart beds". Went out and ordered the same material Smart Pot uses, (was only 5$ a 6x6 sheet), and got rid of that cheap root clothe. Now my beds are even more reusable and easy to move.
Also got one of those botanicare 4x4 tables too, using the same material i made that into a "smart bed."