I got my design from seeing daisys hook, Seems we are all doing the same though. Like to show you mine before I mount it up to the Mu.
The mounting plate (backing plate, hook mount and gussets) is 12mm steel that was welded at MetalWorks in wellington then takin to work and hardened by one of the heavy steel welders at work, I Fab'd it all except for the welding as our welders were not powerful enough to get enough penatration into 12mm plate, hench why i never got my welding tickets
Below is the Full kit, it has crush tubes and 12.9HT Cap bolts, the backing plate is 200mm x 90mm x 6mm plate, and 5mm square washers on the back of that, The round washers are 5mm thick aswell, but due to the amount of weld on the mounting plate they required a small amount of modification
They dont call me Mr Over-engineering for nothing you know.