If you need a bunch of traps, and don't have a big budget, just make the rest that you need out of cardboard. Here is someone that used cardboard for his movie replica instead of wood, and it came out great http://www.gbprops.com/props_index.php/80 Use the traps you bought off of Ebay for close ups. After you recieve the RGB traps from Ebay take a few measurements, then your all set. If you need any more help PM me, and I will try to help you out. And here is a pretty good guide on how to convert a RGB http://www.gbprops.com/tutorials/ghost_trap/1/