Dano’s Spider House has what is probably the easiest set of plans I’ve ever seen to make an 8′ Frankenstein prop. The design doesn’t account for much flexibility after you create it because the PVC frame is not jointed, but if you need a prop that doesn’t require any movement, you’re all set. And if you’ve got the chops to deviate from these plans, you can add whatever flexibility you may need to your design.
You’ll need to create a PVC frame, have plenty of bubble wrap, a set of hands, and a mask, but that’s pretty much it. This thing is easy to build and offers a life sized prop at barely any cost!