Seeking input from those with the requisite knowledge base..
For my Lola T91-50 I needed to design and fabricate new seat belt mounting brackets for both the lap and shoulder belts. I modeled the bracket shape off of my old PFM, except that I increased the material thickness from 0.087" to 0.125".
The PFM brackets were thin steel. My machinist suggests making these thicker new brackets from billet T6061 AL. Given the use of billet and the material being thicker, will they be strong enough? Belts are 2" OMP type. Bracket drawings below. Shoulder belts will wrap around 5/16" AN cross bolt that goes between each pair of the smaller bracket type "ears". Lap belts will attach to the single bolt hole at the top of the triangular bracket.
Appreciate your thoughts/input!