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Wouldn't you want to nail / bolt the frame to the posts, because of the different respective shear strengths compared to screws?
NotThamesWater-
Probably for house building, I doubt a deck would cause an issue given substantial enough screws (mine was screwed and I hammered about on it for 5 years with no issues, and I guarantee I'm heavier than @edmundro)
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As I have said earlier, I normally cut an L shape in the post to exactly fit the frame, then screw it together so the frame sits directly on the post. However, sometimes I have to screw to the outside of a post in places, I haven't had one fail with 4x 6mm stainless screws in 20 years. I have only had one decking come down and that was because 45 tons of next doors' garden subsided straight through it!
stevo_com
ColinTheBald
Getting there. I go 600mm deep and use a bag of ballast per hole, but people can sue me. You will need at least 3 bags of ballast, probably 4, one cement is enough. 2x8' 4x4 posts will do you, each cut in 3 to provide 6 posts, sawn and treated fence posts are fine . You're now on overkill for the 4x2, 1x4.8 and 3x3.o will be enough for 2.4m x 1.5m surface. Don't forget the decking screws, you need 200.