They basically are requesting private lending for their rehabs, say 35k, with a promise of a 60% roi in ~50 days with a committed buyer the ARV.

Of course the worst case is actually getting lawyers involved and I wouldn't go that route I just wanted to make the basic contract law argument about the PoA's limitation. 

You can request a look-ahead schedule from your GC or as Chris stated, create your own to keep track of resources, delays, and other tasks.

They can change terms basically at anytime before closing for non-owner occupied - is it good for the reputation - absolutely not - but it does occur.

You can also create a basic scope of work and get ballpark estimates from contractors or use cost-per-square-foot averages for your area.To determine ARV, look at recently sold comparable properties in the area that are similar in size, style, and condition to what your property will be post-renovation.

You could get the boxes delivered to the property and task rabbits to set them up.

I am basically always looking to buy if it fits my buy box. 

And that was my understanding (the basics, at least :-)...Given that, the scenario that Bob presented in Deal 3 above seems unlikely to play out legally...

ya were we live ( personal resi) we have humungus doug fir trees 100 plus fee tall basically surrounding out lot and if one of those falls on your house it can destroy the house and if your really unlucky it can squash you..

It will familiarize you with the basic terminology and benefits.