Longboard Fin Base Dimensions and Tab Tricks... please

Two new board projects getting started and I plan on making a couple of wood fins for these two boards. I have been all over the archives trying to get the actual measurements for the base of a longboard fin for a FU style box. The width, pin placement (height from bottom), why do some LB fins have the tab in the front? rear?, height of tab, any other relevant info? I could wait til I pick up the fin boxes and take measurements, but then what will I have to talk about?

I looked at greenlights tab they sell for making fins, looks pretty slick. I can make an insert out of aluminium or just make the entire base fiberglass, curious what approaches you guys like best. 

Josh