SD Roth custodians for Private Money Lending?

[Anna Watkins]

I have done my "due diligence" by reading about 15 threads on SDIRAs, and still have a few questions.

Does anyone use a custodian that specializes (or is especially effective with) private money lending (not buying existing notes)? I am fortunate to have a reasonably healthy stocks&bonds 403(b) (401k for non-profits) and am trying to build up some extra in a Roth IRA for diversification. Since I have rentals I actively manage already, I'd like to use a self-directed Roth for private money lending. (it has to be a Roth, given the existing 403(b))

From all the posts, I gather that different SDIRA custodians are better at different kinds of RE investments.  Folks who have responded to various threads --

1) Do you mix different RE investment types within one IRA? or

2) Do you have different ones for different purposes (flip, hold, buying existing notes)?  

3) Have you worked with private lenders who use IRAs for their lending?  

3) Any chance I could talk with one of them?  I'm strictly small money, but want to be wise small $$ :-)

4) Has anybody heard of using IRA money for RE crowdfunding? Seems a way to start on a very small scale, but perhaps sketchy rule-wise.

I'm tagging y'all guys below since you've been helpful in the threads I read earlier.

Thanks!

@Abhi Golhar - How's the GroundFloor project going?  I'm following with interest.

@Rick Baggenstoss     @Will Barnard    @J Scott