Help w/ solid wood dining table

[quartz fossil]

I'm looking to build my first dining table and could use some help to make sure that my build is structurally sound. Attached some really rough plans.

This will be made out of 8/4 white ash. The target dimensions are 28" H, 96" W, 42" D with 2" tabletop thickness.

For the tabletop, I'll glue together 2" x 4" boards. (From what I understand, really wide boards can have issues with warping.)

I'm planning to make each leg 26" W, 4" D. I'm going to carve a design into the faces of the legs, so I want to make them thicker by gluing together the faces of 2" thick boards.

I'm wondering if I can put the table together with the following methods (pictured):

• Attach the legs to the tabletop using sliding dovetails, similarly to this: https://www.youtube.com/watch?t=1233&v=4FQthDrMjoo&feature=youtu.be
• Attach the stretcher to the legs using a mortise and tenon.

Will this design provide enough support for the tabletop? Ideally, I want to keep a very simple aesthetic with a single stretcher.

How do I account for wood movement? For the sliding dovetails, I read that I should apply glue only to one end to allow the tabletop to expand/contract across the grain. Do I need to have additional clearance on the edge cheeks of the tenon to account for wood movement?

Appreciate any advice I can get!

[high imp]

I believe the stretcher will not do all that much as it is. For rack resistance you need some height to it, at least towards the legs.
I would recommend doing a wide board along the edge of the glued legs in order not to have a seam there.
You will need the dovetail slot open towards one side of the table unless you want to do a complicated sectioned dovetail joint (mr chickadee did a coffee table like that iirc). You can glue in a piece into the gap or bevel the table underside for it to be less apparent.
Sound thoughts on the joint otherwise. The tenons grain orientation will be in the same direction as the legs (assuming the grain runs vertically), so it will move similarly.

[quartz fossil]

dovetail slot open toward one side

@high imp Yeah, I was planning on cutting the slot like this (but on the bottom side, ofc) and then adding/gluing a small piece in the gap

wide board along the edge of the glued legs in order not to have a seam there

Could you elaborate on this? I'm not sure I'm following what you mean (sorry, I'm definitely a beginner!)