Found out a few things.

Found out lug wall thickness should be 1.2mm.

Found out [MENTION=175208]gaucho777[/MENTION] has an excellent eye. I thought for sure the thickness at the ridge was 2mm but in reality it was 3mm.

Found out 3D stainless printing for just 1 of each of the 3 lugs is $5000. Yikes.

So I am currently obtaining quotes for investment casting. I changed the wall thickness from 1mm to 1.2mm. And the ridge height is now 2mm, 0.8mm taller than the thickness. I also changed some proportions and added a bevel instead of straight walls for the triangular inset. I'm also too cheap and lazy to print the new refined parts. All you get are images from my modeling program.

Lugs09 by iabisdb, on Flickr

Lugs10 by iabisdb, on Flickr

Lugs11 by iabisdb, on Flickr