Have built numerous BH targets over the years.
Easily the best I have constructed, consisted of 3D club throw away targets. Most of the actual target has seen little to no use. Section the old 3D targets with a reciprocating saw… cut to fit tight within an old dock float box. Then pour a post foam, from Lowes, to fill in the small gaps. May have $30 in it….has been beaten hard by my wheelie hunters and has absorbed 100’s of my own traditional BH tipped arrows…same target is still in fine shape after two full seasons of abuse…have owned several commercial BH targets…none have lasted more than a 1/10th as long.
Large but still portable...