You're going to find it is cheaper to buy the cable all in one.
The reason is, you have to buy wire, fuse holders, and the plug. I'm sure Yaesu isn't much different than Icom; the parts to duplicate the factory cable is nearly twice the cable's cost.
That said, I build my own, but when I ordered a new plug for my 7000 Icom wanted $12.50 plus shipping, and they didn't have one! I ended up modifying the original as I couldn't even find a replacement cable. So much for buying a new-on-the-market radio.