I have to say that the show on the History Channel was right making the Cullen Device, or mor affectionatly know as the "Hedge Chopper," is quite difficult to build. I have a cut or two on my thumb from trimming the Tamiya Tank Barricade I-Beams down to look like the original. I used two of them, one to fit onto the tank and another I cut into four eguil lenght peices to glue onto the long I-Beam. The four small peices I trimed to top off the "i," then I trimed the bottom of the "i" into a point on one end. It was difficult working on smaal peices like that but it look great. However I am hesitant to attach it to the first Sherman I have ever built, especially because of all the work I put into it.