Looks great!  Those barcode stickers, Uggh :-(

Arm bow is in the bending form!  One small split, but hoping cosmetic only!  This is green red oak. I think I'd stack the odds in my favor more if I had a backer strap on the bend.  Had to recruit an assistant for this maneuver!

How strong is hide glue? Strong enough for a seat?

I took top of the donor desk I'm using for the project to a FIG meeting. And consensus was 4/4 quarter sawn tight grain white oak. Since the plan calls for 6/4 seat, I'd considered stacking the halves of the top then planing down to 6/4. But even at 4/4 it's pretty hefty. Someone also pointed that out, as well as that the seats of all of the stick chairs in the house we were at were about 4/4. 

All good, but now it occurs to me the top is actually multiple boards - is the existing seam likely to be solid enough??? Looks and feels tight, and there's what is probably hide glue on the mortise & tenons, so probably hide glue on the tongue & groove seam. That enough? This design doesn't have stretchers, so a bit more torque on the seat.

As a side note, the carrier frame for the desk top has a corrugated fastener at each corner, so between that and the hide glue means 40's or 50's.

Hi Ray,

I's suggest re-reading pages 20 & 21 on chair seat material.  Looks like all of your questions posed are there. He covers use what you got through solid oak.  

Glue?  Remember most times the wood fails before the glue joint fails. 

Lack of stretchers?  Chris would quote Joey from Friends: "It's a moo point" There are just as many hundred year old chairs with no stretchers as there are with.