I wasn't aware he made Walker style nets either!
I know he sold three sets of metal work for the Walker style nets, on eBay about two years ago. However, he does sell a net head made using a modern commercially available metal spreader block with arms made from split cane sourced from a stash of old rod blanks. The system is rigged in the same ways as a modern net in that it uses the natural resistance in the arms to hold them into the spreader block under tension. It's a very elegant solution in many ways and I suspect Walker would rather like it since it is lighter, easier to make and more practical than his own design. It just doesn't look quite as nice!
Sometimes the net heads are sold with handles, these are usually reclaimed from old split cane rods and have a cork handle.