Update:

Since my last post i've worked on countless designs for a heavyweight, before i finally settled on something i'm happy with.

The idea is to use a hardox pipe as armor and build a torque-reaction thwackbot. To make transporting and storing it easier (or at least less problematic), i'm designing it to be modular and relatively easy to take apart.

One issue i did have with this design is that it was turning out to be very light for a heavyweight at around 65-70 kg. Rather than making it a lot bigger or adding a lot of dead weight, i decided to scale it down to around 50kg instead, making it a middleweight.

However...
There's not much point in making a middleweight if there are no events held for this weight class anymore. From what i've read on this forum there seem to have been a bunch of middleweights built in the last few years, but does anyone know how many of them are still active nowadays?