This is exactly what this is - a DIY project.
It would be nearly the same cost to make a few by hand and sell to you as it would be to buy commercially.
Have you seen this?
http://flytron.com/16-openlrs
Forum support as well
http://forum.flytron.com/viewforum.php?f=7&sid=5794eb0b6f028f25cacb8b980bba52fa
HTH
Nigel.