Pullup rig built last weekend

Built an outdoor pullup bar rig for a friend on Saturday.
Requirements:
Stable enough for a 240lb person to swing around on
Non-permanent(didnt want to set posts in concrete)
8' tall bar

Inspired by these rigs made by Rogue

Below is what I came up with.

Wife testing it out

A few questions:

Ideas to minimize side-to-side sway. When he swings above the bar to do a bar muscle-up(google it), there's some movement to his left/right. Maybe some gussets/angled supports like this?

Any tips on getting accurate cuts for mitered joints? To do fully mitered corners on the triangles, I would have needed ~29 deg cuts. My bandsaw can't make such a steep cut. Had to go with butted joints. Event those cuts were a bit off and required some grinding to get everything to fit before welding it up.

I told my friend to buy some plastic end caps to keep water out of the open tube ends. Think those are water tight? Maybe he can add a bead of silicone.

Thanks,
Michael

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