I'd be more concerned about the placement of the chandelier. If you center it in the room, it won't be centered over the dining table if you add a china cabinet,

The chandelier bottom should be at 60" off the floor. How high is the body of the one you like? Is it short enough that you'll still have a decent length of chain above it? How wide is it? In your room, it should be approximately 22" wide, give or take a bit.

BTW, we have several three=way switches with dimmers.

That particular chandelier is 25" wide and 32.5" high. I'm not set on it, just like that style.

Well, I guess I can forget placing the outlets high enough for sconces. The studs aren't spaced right. It will be less noticeable closer to the floor.

Get some boxes and mock up your furniture placement, then center your chandelier on your table, NOT the room.

Any opinions about where to put the plug outlets?

The more outlets, the better -- within reason, of course. This eliminates cords snaking along the walls, Your layout above looks good, except that I would add one on the left-hand wall at the bottom (near the kitchen) and possibly one at the top of the left-hand wall, just in case you decide you would like sconces on either side of the window.

For sconce placements they can add bracing to your existing studs to get outlets where you want the sconces.

Both good ideas. I do like the idea of spots directed to the curtains like someone said on my other thread. If I put sconces on the window wall, would it look funny not to have them on the patio door wall?

lyfia, you're right, and I don't know why I didn't think of that, except for feeling overwhelmed right now. My dd is getting married in 3 weeks too and I haven't even got a dress for that yet!

The electrician still hasn't come, so we're still kicking around ideas. Here is what we are thinking now. Tell me if you see any drawbacks.

The outlets on the solid wall: Put them at the usual height 16 inches off the floor, but closer to the corners. Then, if there is no room for a regular china cabinet against the back wall, there might be room for corner cabinets. Either way, the cabinets would cover the outlets. Higher up, or even lower in the previous location and the cabinet light cord would be in view. Maybe the electrician can think of a way to put sconces on the wall without hard wiring them in.

Then, dh thinks we wouldn't need the outlet by the patio door.
{{!gwi}}

Then on the switches, I forgot about the living room lights. When coming in through the back door, we can turn on the kitchen light or the dining room light beside the back door. The living room light used to be in the wall that we took out between the kitchen and the new dining room. So it makes sense (I guess) to put it in the box on the far side of the dining room. Then put another box on the other side of the patio door for the patio light and for the two wall outlets on the solid wall. Then, if china cabinets or sconces are there, we can turn them on with a switch instead of having to open the china cabinet doors or turn on each sconce. Or would it be better to have all the light switches in one location?

On the spotlights, dh only wanted them in the corners. I want to add one in the center of the solid wall directed at a picture. Think that's enough?
{{!gwi}}

This may be too late to help you, but I have found that putting a receptacle below a light switch is good in any room. Very, very seldom is furniture placed in front of the light switch, so you will always have a receptacle for the vacuum or any other temporary use. Lots better than trying to move furniture to get to it.