Understanding your end goal and your buy box to help you get there are incredibly important IMO. 

It is always recommended to do a cost benefit analysis before doing a project to determine the feasibility.Whether using private money or not the cost benefit has to be addressed.It will affect investment and equity when measuring profit.

When these payees are shared across all projects, it's a mess tracking what expense goes to which property.What's the simplest/easiest way to do this?

in return for being allowed to promote the projects on their websites, hold themselves out as the co-gp etc.

Particularly be sure to include your goals for real estate investing so that folks can help you. 2) Follow your favorite forum topics and set up keyword alerts!

What are some banks/lenders that have loan products for development/new construction projects (building from the ground up)?

He's financed my last 12 projects, including 5 construction-to-perm loans.

Not to mention, I was oblivious to how much work the units actually needed as this was my first property and rehab project.

Everyone has different circumstances and goals.

Consider the potential equity loss and cost to originate another loan versus your REI goals.