(I have little to no experience)Does anyone have any advice?

Some advice and experiences from you would be appreciated.

I started local because I was more hands-on and wanted to experience the process.

Does anyone have experience with this or other options in using Fund and Grow credit cards with conventional/unconventional lenders? 

Could anyone share their experience or advice on when is "too low"?

Was curious if anyone had experience?

If yes, and if you do not have much experience yourself, I would engage a local civil engineer to guide you through the initial planning phases even before you get to design & construction. 

@Nicole TuffarelliI am aware of a few groups that can usually utilize funds from an IRA to help purchase new homes at reduced leverage (usually capped at 70% LTV).It might be more beneficial from a tax-standpoint as well to do it that way instead of drawing it all out.

LLC, make him a member, Trust, assign him part of the beneficial interests.

@Bob Stevens I totally agreed with all this through my first time experience.