substitue trays

Anyone tell me if there's any reason why I couldn't use the "storage" type
of plastic boxes they sell a Kmart or Walmart for shoes and clothes to
develop prints in as opposed to buying new trays? I recently bought a larger
easel very reasonably and I'd like to keep from spending over a hundred
bucks for a set of 20 x 24 trays. So I thought I would buy a few of these
storage boxes and cut them down to trays . Then i could get buy for about
$25.00. They wouldn't have to last forever at that price - in case I finally
make the digital move.

Thanks,
Matt A.