[Mithriil]

Using HN as a cluster of people with different knowledge and ideas seems like a good basis, although it might be a little too big.

About idea sharing, I've seen some reluctant commenters on a "Ask HN" post about side incomes when asked to share their ideas. I hope it's not a pullback force strong enough to stop your initiative.

[conrad-mac]

Yes, my initial thought was that the community is quite large which might be somewhat of a barrier to getting something going.

Re: sharing ideas. I agree, although I sometimes find myself with a similar mentality when I have a new idea so I can somewhat understand.