The anchor ball was quite easy to make. It's two black plastic holes with a slit cut to the center so they join together to make a ball. It folds flat and I've drilled holes in them to attach it to my flag pole.
The anchor light was a bit of a headache. First I looked around for quite a while to find a small but bright light in a housing that allows the light to be seen from 360 degrees around. I finally found such light on Ebay. It's powered with a standard USB connector, 5 volts. Which is handy cause I plan to take powerbanks and a solar charger with me on the boat.
I then cut a wooden rod in half and hollowed out the center for the power cable. Glued back together with epoxy and I have a mast with a small light at the end.
Now all I have to find out is where to put this mast on the boat. It should be removable and not permanently on the deck but I am also very hesitant to cut any holes in the deck. Need to think about that some more.
In the meantime check out the photo's of the build and the result.