Heres a big boy sand box. I built this sandblasting box outta scrap ply from around the shop. stuck a nozzel and filter in it. I have a smaller version at home but needed something to to large things in. When I need to do the cross members under the engine I will just cut a hole in the end and stuff rags around the hole to hold in the sand while blasting. Good thing about free tools is when you get done with em there is no hard feeling to get over when you chuck em in the dumpster....lol..