miamibeachcg

I found this at a local thrift store today. Is it a old school Mongoose? Is it a Mongoose? If so what year & model?
I'm worried it may be a Frankenstein bike of different parts because the pedals are mis matched & some of the other things I've never seen.
There is...something on the front forks below the handlebars with 2 holes - the only thing I can think of it's to hold a racing plate with the bike's number? (3rd photo from the end)
It also has some heavy duty welding even though the bike is really light (I think it's aluminum?)
Any information would be appreciated.