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I know it's a stretch, but I've been having a problem explaining a problem I'm having in search forums and results to get the answer I need, and I figure, hey - there area lot of guys and gals making roasters so some may have an answer to my dilema.

Here's a sketch
https://docs.goog...sp=sharing

Basically, I've made a triangle shaped frame that is a "treehouse" base. I say "treehouse" because the tree is in the middle. I didn't want to nail into the tree or anything, so I've done a basic 4x4 free standing structure, kind of like a deck.

Basically it's wobbly. whenever I push on the "front" sides left or right, the whole things sways side to side. I've tried putting some boards on the end of the triangle to firm it up, but it's still wobbly. Is there any way to reduce the wobble? I'm afraid after I put all the boards up for the floor and nail down some plywood it will still sway back and forth. A lot of time and money for an unknown situation.

Thanks in advance.