Ideally, I would prefer to capture their existing bookings after closing, by directing existing bookings to my new listing, but there are some dependencies/uncertainties I'm working through and would appreciate any advice or shared experiences here. 

It's a tip I heard from someone which I heard increases the response rate. 

@Pamela RickeyThank you for sharing that Pamela.

Connecting with local GC groups in your area will help you connect with subcontractors, find out tips and tricks of the trade in your local area (since all areas and their real estate differ slightly).Also, have you considered the motivation behind building a brand-new duplex versus finding one on the market?

Send me an email or a message here and I can offer some tips I use to maximize profits in FL.  

I'd use an approved underlayment.Pro Tip: If it's cheap, it's not good.....at least spend in the moderate range.

Do you have any tips on how to approach and structure deals with private lenders for scaling?

I'm looking to not only share my experiences but also offer my services to those who might need them.

Only other initial question I'll leave here is that I'm looking for REI mentors and hope to find a few on BP willing to share a few gold nuggets to those willing to slog it out in the mines the smart or hard way.

Sharing proceeds can be documented through a contract or settlement agreement without title changes.