These are 4' T12? If so, reconsider linear fluorescent. Modern ballasts run at 20,00-60,000 Hz rather than 60 Hz so you can not hear them. No flickering either. Even i they are odd length, it might be worth it. You can install T8 or T5. I've never been particularly fond of the idea of dimming arc lamps, but why are you against it? What you might consider is installing the lamps in groups of three in each tray if they fit. Switch them so either one or two come on in each group with a switch throw. That way you have three light levels, one lamp, two lamps or three lamps/group (33%. 67% or 100% if you use all the same ballasts). Adjust the amount of light installed by using low, normal or high ballast factor ballasts. There are now ballasts that can operate at two or three brightnesses as well. They use a separate control wire rather than a dimmer. Light quality and color are better than ever. CRI 90 is not unusual, and higher is available. Triphosphor tubes are available in color temps from 3000 to 6500 with lots of choices in between. You might well be able to use your existing luminaires if that is easier. You have to pay attention to the sockets. Are they instant start types or rapid start? I'd not install instant start in homes under normal circumstances. They are no good for frequent switching. If you can't run another switch loop to the switch boxes easily, you might be able to find a remote that will work. You can keep searching for LEDs, but cost will be much higher, and light quality will be lower. Even lifetime cost might be higher if you pack enough leds up there to have the same light as linear Fl. Installation costs certainly will be very high.

I would go with terrazzo since going with wood would be a poor design choice. I am not a fan of wall to wall carpet for a variety of reasons so that wouldn't be an option for me. Terrazzo is both true to the period and would look great with that style of the home. It is also more of an investment to future buyers as anyone who is looking for a classic MCM home is going to be thrilled to find terrazzo. However, wall to wall would no doubt be cozier but would need replacing fairly frequently

Your realtor is giving bad advice, leave the brick alone, you will disappoint the diehard MCM buyers. Your eye goes to light colours first, so leave all the trim especially at the roofline light, no black. If it was my home, I would consider painting the walls a warm taupe/grey, it has to work with the roof color, the brick and the mortar. Choose your colors carefully, you should hire a color expert to be on site. Or don’t paint at all, leave it to the buyer. Maybe the wood at the entry can be restored. Please don’t change anything that is authentic. This example photo shows how the wall and carport support was painted a color to work well with the brick.

When we re-did the bathroom in our house that's built in 1955 we did a mix of modern and throwback to the mid-century look since that's our favorite aesthetic. We used an IKEA base cabinet that we floated on the wall and I still love it. Also still love our tile choice for the floor, harkening back to the original pink floor tile that was sadly long-gone buried under ugly 90s tile on top that we had to rip all out, but did get to see it at least in bits while the floor was ripped up. Don't mind our truly terrible decision to use white grout on the floor, lol. Or the cream bathmats, This photo was right after the renovation several years ago so hadn't replaced those yet (they're now light blue).