Getting fabric and a new sewing machine on Tuesday, so I'm working on the prop.
The base of the hammer is cardboard tubing, and I'm bulking it up with newspaper. I'll paper maché that for strength (it's gonna need it), then wrap cardboard round it to give it a nice round shape. Paper maché again, and paint! The handle is an extendable window cleaning tool, that unscrews apart, so I can deconstruct it and travel with it in my bag. I've fixed one of the heads of the tools into the hammer head, so it'll just slot onto the handle as designed (plus the extra weight of the head, we can always hot glue it in on the day if necessary).
The green line is my height standing straight against the wall, just for reference. Of course, the hammer isn't straight against the wall, and I'll be about a foot taller from my footwear and ears, but it gives an idea. It's about 1.6m tall full constructed so far.
THIS COULD FALL APART AT ANY MINUTE I AM SO TERRIFIED.