We'd only need pros for electrical, plumbing, and HVAC. 

So it is owned by a realtor, it's been gutted so needs full electrical, plumbing, windows, doors, drywall etc.

The roof was replaced in 2015 so we are focusing on the plumbing and electrical and we plan to do all the windows within the next few months.

My action would be to call a plumber and have him remove the disposal and plumbing it solid.

For plumbing related items we go to a local plumbing supply place we have a relationship.

It has separate, electric meter, plumbing, egress, and natural light.

You just need to get a letter of intent from your plumbing and HVAC subcontractors. 

Given they manage appliance, plumbing, electrical, HVAC, etc, most of the calls will be diverted to them instead and it will reduce my workload.The only downside I see is that they charge 100$ per visit and if the tenant calls too many times, then that bill is going to increase, but I live in Austin, and 100$ is nominal for a house visit.

These figures will vary greatly depending on the location of the property, the level of fixtures and finishes, etc but here are some rough figures:Kitchen - 8-10k, or moreFull bath - 5-6k, or moreHalf bath - 2500-3k, or moreUpdating plumbing - this is hard to say... slab or raised house?

Do all the electric, HVAC and Windows and plumbing in the whole place, but only complete the work in my unit and move in.