There is one part I'm having trouble understanding which is the "splay" angle of the legs. In you first post above, you said:
The legs are angled outwards with 6 degrees or 8.6 degreed towards the table corners.
I also had to calculate the angle that I had to drill the holes at in reference to the guideline made toward the table corner. This was different from the angle
wanted towards the short-end/long-end of the table.
I wanted 6 degrees towards the short-end/long-end. After a bit of calculations (took me about 3-4 hours to figure out the angle, with some help from a math forum). The angle needed was 8.4 degrees.
Your radial arm drill press can rotate the head as well as the table. Was it necessary to do both to get the correct angle?
So, are the legs splayed in both direction OR a compound angle, right? You said that you had a lot of difficulty determining the angle, and I'm wondering how you arrived at what you ended up with. It would take some plane geometry IF they are splayed both ways or compound.
I see the following photo of your calculations ... scary!
Me, I would just hot glue a broom stick/dowel/extra leg to a plywood base, stand back and adjust it until I liked it and THEN determine the angle(s) with a Digicube. Then over to the drill press and make a test hole to see if I got my numbers right. Higher math scares me, but I like the challenge. I'm a "cut and fit" kinda guy.