My first thoughts...

David Weaver
..since you were mentioning the materials was to lighten the load on the posts and fasteners, and perhaps brace smaller posts and reduce fasteners, especially on the facing boards, and eliminate the angle plate by fastening the posts to the tie sides.

But if 80% of the cost is labor, it's a matter of eliminating materials that cause labor, or trading materials to some with less labor.

i've never built a deck, so don't know what's suitable, but my first choice would be smaller bolts and perhaps two cheap plates bolting 2x4s or 2x6s sideways to the ties and the rails bolted straight to them.

I haven't been following the number of ties, but fewer ties if they're more dense than they need to be for people and light maintenance vehicles (build the floor more like a wagon bed)

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