Constructing the Tasset
First decide how many links the base of the triangle will be, let's call that number N, then construct three rows of of 4 in 1. The top row will be N links, the next row will be N-1 links and the bottom row will be N-2 links. By dropping links from alternating rows you will create an isosceles triangle. Then attach the triangle to main piece. Thus the pattern looks like this:
(( 2) 1
A note about the pattern diagram above, the rows of links in mail lie against each other creating upper edge and a lower edge when the mail is lying against a horizontal surface. The brackets indicate upper edge of a given row.
Apparently what I've been calling tassets are actually dags. See below the current progress on the dags.