all correct description of the way froes are made
most modern froes are a flat bar with a single bevel (ie a straight woodlore blade) and have a tube welded to the end. They are relatively heavy and the welds either sheer off or the blade twists unless it is a better made one that has a heat treated steel blade.
Old froes were a wedge shape blade (full flat grind with convex secondary bevel), the eye being wrapped around and fire welded together. These are lighter, stronger blades that slide alongthe split more easily. the eye is more secure partly due to the forge weld but mostly due to teh fact that one side of it is a solid strip formed from the blade.
Modern/Old home made or types are often made from leaf spring wrapped around to form an eye but have a bevel ground on, so is a hybrid of the above methods. Stronger eye (especially if welded) but heavy less efficient and elegant blade.
I've not seen the GB froe up close so I don't know whether it is fire or electric welded together. My froes are the old fashioned V shaped blades with a wrapped around and electric welded eye. I do my yes that way because it is less difficult and in this instance no less strong than a forge weld. Mine are also heat treated and spring tempered (including the eye and thus the connection with the blade) so that bending and twisting won't happen even if used in silly situations
an average froe will be 10-12" blade, 2" high, 1/4" thick with a 1 1/2" diam eye. As mentioned earlier, sizes and specifics vary according to the intended use and the manufactureer