@ northsea
Absolutely cool design and great action , but for a reproduction you'd need tools and skills for working with metal .
You'd need to build an accurate aluminium mold for the blade connected to the rear wireform to fit in and then bonded by the molten lead , that you pour in .
As blades you could probably use willowleaf spinnerblades with one tip cut off ?
Or you cut your own blades from sheet metal with shears , 0,5 mm stainless steel , 1,0 mm brass and 1,5 mm copper cut quite easy , with only 0,5 mm thicker it could get to an nasty effort !
One brief idea :
Cut blade in about the shape of a shovel blade , triangular as shown , but with a slender extention at its rear .
There should be two or three holes in line in that extension to guide the wire form through to somehow sit reasonably rigid .
Take an teardrop shaped inline sinker , extend the center hole at its fatter side maybe halfway down for the blades extension to fit in .
Also cut a slot centered and aligned to the hole for the base of the blade to fit in.
You can lead the wire all way through the hole to bend the attachement hook on its rear and epoxy all together .
Its just a brief idea from afar , it stands and falls with the required size of that leadhead , if too tiny , there won't be enough room for this construction .
Also it is PITA to cut lead with a metal saw , you need to clamb it somehow , and it will squeeze together !
Maybe put a nail or similar into the center hole to keep it open ?
That leadhead , if it should work out that way , would surely get to look very ugly due to all toolmarks on it , but this is the only way , that I can think of on a short term , at low cost and without the need for a mold .
good luck

, diemai