Our cabinets, though old, were in pretty good shape and now look lovely with our new paint job. I think with older homes it is wise, as you are doing, to consider the period of the home and work with it rather than do what is currently popular. And I think each home has different needs so I'm sure you'll love your new cabinets! I have to admit I was a little sad to see our 1950's GE Stratoliner range be sold but that electric cooktop was so hard to do anything but boil water on and not much could be on simultaneously, and I fell in love with the Lacanche. Anyway, I also agree per above posters that style wise it doesn't have to all be one era. Our vintage artwork is from the 30s, our red formica table and chairs (not in the pic) are from the 50s and our cabinet pulls are newer but probably 50s inspired. I love the pulls you picked and I like the 30s-50s updated kitchen in the last several posts, which seems like it would work with your bathroom staying as is. One thing we considered is that if we tore out the kitchen and put in a true MCM kitchen it would look wierd with our 1950s extensively pink tiled bathroom and then that would need to be updated. By keeping the style of our kitchen to its era, the kitchen and bathroom seem more in sync and I don't seeing us (other than putting in new grout and maybe painting the walls) changing our pink tiled bathroom, which also made our approach more cost effective. I think doing a blend of 30s-40s to early 50s, your bathroom would fit nicely into the updated kitchen.

Congrats on your new home. I think you've got a good start. I like your sofa - it looks comfy and is well proportioned in the room. A fun shag rug and some bolder, graphic pillows would be my suggestion -- or another colorful rug that might brighten things up. You could also add a starburst mirror on the wall next to the windows. I would put a plant behind the yellow chair and bring a throw pillow that coordinates with the ones on the sofa to tie it together. I would also put a long console table behind the sofa with a single lamp on it like the below photo: I'm intrigued by the concept of new build in MCM style. Are you in CA?

I have a house that's very MCM on the inside and rather ordinary looking outside. we updated our garage door and it made a huge difference. (it's like the one pictured below, but in white.) I really like the mockups celerygirl posted. I think her ideas are going to be your best bet. you're not going to really be able to make your home look like a true midcentury, but improvements such those will make it look up to date and MCM inspired. I think funky landscaping can really help, and don't forget little touches like lighting.

Shiplap ceiling with beams can provide some interest especially if you have a lot of windows. I'm not sure about plantation shutters. But it is modern to have a consistent covering. I think walnut and painted cabinets would look great.