Alexander,
I work a full time job and I am running my investing business on the side. I eventally want to go full time on the investing side, but my business isn't quite systemtized yet to make the leap. So far we have successfully flipped 2 houses though so it can be done -- though it is proving to be a much slower process than I originally thought.
I take care of a lot of my business meetings during my lunch hour. I can call and talk to people on short breaks at the office to set up meetings or discuss something realtively quickly. But if it requires a meeting I try to schdule it during my lunch break. If it runs a little over, I work a little later at night. I started by calling around and talking to banks on the phone, then meeting with them in person once I thought it would be worth my time.
My business partner is a GC so he runs that side of our business. So he is the one that manages the rehabs and is on-site for everything construction related which has helped a ton during this stage.
Can you bring someone in on the deal to handle the construction while you're working for a percentage of the deal? That way they have incentive to complete the work quickly and on budget bc that will mean more money in their pocket. If that's not desirable then maybe hiring a GC you trust that will be doing the work and then stop by after work and check on progress and answer questions etc.
Most GCs I know and realtors too will work after 6 (brief meetings, etc), and a lot of relators work on the weekends too to help you look at properties. The realtor can also help set up a meeting for a GC to come inspect the property, or you can meet them out there just about anytime you're available. You are the one that is going to pay them, so they should be willing to accomodate your schedule.
Hope this helps. Good luck!