I noticed that funky bracket on the rear stay not sure what it would go to. the link you sent looks close but the bike has a looped rear triangle. Im picking it up this evening hopefully I can find something to identify what it is.Hmmm, that's a really unusual stem, and the gussets are pretty unique too. Might help with identification. Not sure you have all the original parts, looks like something is missing from that bracket sticking up from the seat stay.
Possibly a PMX?
https://bmxmuseum.com/bikes/pmx/50614/3
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