They also are single panel and few insulation issues as some of them have gaps between the window and casing. 

Moisture resistant drywall will be used in all wet locationsAll ceramic tile will be installed on 1/2" cement board or a concrete PaintNew Switches, Receptacles, GFCIs and cover plates to codeHardwired smoke detectorsCarbon Monoxide DetectorsBathroom: Install Ceramic tile on walls for tub and floorInstall new pre-hung 6 panel hollow core doorNew Toilet with ring and supplyNew Vanity with faucet, drain and supply linesInstall new light fixtureInstall bath exhaust fanNew medicine cabinetInstall New TubBathroom Accessories (Toilet paper holder, towel bars, etc.)Bedrooms / Living room:Install new pre-hung doorInstall all trim ( Door Casing, Base, Shoe)Install Flooring material (Carpet, Hardwood,Laminate )Install New Light fixtureInstall Closet door (Type to be decided)Kitchen:    Install Ceramic floorInstall New kitchen cabinetsInstall Counter top (Granite/Corian/Laminate)Install New Undermount sink and faucet Install Ceramic backsplash with accentInstall Light fixturesInstall garbage disposal (if applicable)Install Dishwasher (If applicable)Install all trimInstall pre-hung pantry door (If applicable)All material types will be selected by you and installed by us.

After looking under the carpets and paneling, we found pristine shiplap on the walls, ceiling and original hardwood floors... we immediately choose a cottage modern style for our design. 

Any large ticket items (new panels/HVAC)?

I then went to the breaker panel and flipped all the breakers on.

I don't know how long it keeps it for, but the ring camera has an option for a solar panel to keep it charged, records motion and costs $3 a month for storage.

If not you will probably need to make a wall with door from the left fin wall of the bottom stair to the wall above it so that is a safe exit in case of a fireYou would also need to make sure you have room on your electric panel or pay for another electric meter and panel

Specifically electrical panel upgrades and plumbing issues that need to be addressed.

The two meters and panels are pretty straightforward.

Might be able to just cut a small access panel to fix it.