Mutli-leg Sheet Bend is what asking about? Multi-bights or eyes to 1 lock?
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Might also try 3 legs to metal ring/clevis etc., then a main to top of ring etc.
Might try legs around metal and friction hitch back to selves for adjustments to level even after perhaps uneven stretching.
simple sheet bights do present this also, not as cleanly.
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Might try main to 1 corner of platform and friction hitch center of 2nd rope to main and use the ends as final 2 legs of support, but prefer main thicker for that. Perhaps better to have individual friction hitches to a main of same diameter.