Here are some thoughts I had.Potential Backlash - I agree with @Erik Estrada that charging fees might draw criticism from some community corners. 

Could you share some tips on how to find the builders or is there any platform that I can use to reach out to multiple builders to get quote once the architectural drawings are finalized?

.• Understanding the rehab budget draw process: After you close on a rehab loan, your rehab budget is not handed to you at closing.

It provides more clarity for me as this is new and uncharted territory - especially how the repairs/draws take place seeing that this was a vacant fixer-upper and the lender in 1st lien has a rehab loan.

They did not do construction draws you needed your own cash for that. 

You'll quickly see why AI is not the solution here... not only will it give you a random number from a site that posted it, but it will hallucinate and draw quirky assumptions into the mix like oh based on this % appreciation and applying it forward/backward, etc.

Get architect into the house when you are in escrow, get all drawings and site visit done while in escrow along with prep to submit once you close 2.

@Danny RandolphYeah, I’m currently in the construction field and we usually get a 20-40% deposit, then get draws after certain stages/inspections have been passed

What I really really like about this income snowball strategy and drawing me into Tardus is that, in due time, I will have a snowball big enough to pay down a $70K+ down payment for a rental in no time, allowing me the capability to quickly purchase another rental and paying off THAT down payment in a short period of time.

If you had eyes on the property and have a good idea on all this you can hit the HML for all the costs and take draws after the initial acquisition to do the rehab for the rest of the amount.