Hi,
I am looking at building an outdoor bench 3.5 m wide. I will be building 3 x stud frames using 70 x 35 treated pine. One in the front of the seat, one at the back of the seat and one for the seating. To build the frame, which screws would you advise please? Should I use 14g 75m bugle head gal screws or can I get away with 10g buildex 65mm screws for attaching the vertical support timber pieces to the outside frame? Please refer to the sample photo attached

Thanks,
Tej