If I intend to fund the rehab with my own cash, do I need to disclose my rehab budget?

Then it could be quite different and just make the gate motorize, move in base and rent to trucks ( yes i get way over simplified), going to look for more resources on that possible route as the required capital would be drastically less for possibly a better ROI. 

Google is your friend.The FEMA 50% Rule is a little-known rule that limits rehab budgets on homes in a flood zone to only 50% of the value of the STRUCTURE.

Or in the case of appliances, who meets the truck, checks the products and signs for them?

If it is keeping you up at night and pinching your personal budget quite a bit, that's a different matter.  

Talk with an investor friendly mortgage broker to determine your budget for a single-family and a small multifamily property. 

I add 20-30% to any rehab budget for contingencies / as a buffer, and Im local to my projects. 

Ensure that the updates are of high quality yet within budget to maximize the increase in value.When it comes to refinancing, after completing the renovations, you can refinance your home to access the created equity.

In addition you need to budget for maintenance/repair, capital expenses, and also to cover the vacancy/turnover the next time a tenant leaves you.

When you have control of your budget, money saved, and enough knowledge to be dangerous, take action!