1+1=? Have any Indie Hackers joined to build something?

The title is somewhat basic.

Curious to know if anyone has "matched" here to build something together.

What was it?
Did it work/fail?
Still in progress?
What did you learn/postmortem?
Would you do it again?
What would you do differently?

let the community know!! (if you're up to it)!

thanks