Here’s my early days work on a P-frame or…. should I call it the B-frame… in fact I’ve currently dubbed it The Flans Flag Frame 
And here’s my childish drawing for you all to have a good laugh at!
I literally did this in 10 mins so better ideas will come up - more to scale as that wheel is meant to be a 700c but it looks more 36er ish.
Here’s the linking to the rim and tyre debate that’s been annoying picking Simon’s brain and past work in this space:
I think my soul is saying get the WG44 as I learned from reading the French forum I can ask LB to drill spoke holes off centre to get a faux asymmetrical rim set up and my spoke tensions on a 32h Schlumpf hub would be 100%/53% which is more acceptable for me.
WG44 Disc Carbon Gravel Rim - Light Bicycle
WG44 Disc Carbon Gravel Rim - Light Bicycle
WG44 - 700c carbon ultra-wide gravel rims of 30 wide int 38 wide ext 44 deep. For (tubeless) tires of 32c-70c. Made for big elevation and off-road pursuits. Light as 385g.
- It’s a gravel rim
- 30mm inside width
- Hybrid Hooks
- 700c
- Tyres 38-70c - so in other words “fat” wide gravel
- They even quote decently high PSI for 38c
So the boxes ticked by the WG44 pretty cover all I want as I’m after a tough, stiff and gravel focused touring wheel where I’m not super focused on it being the lightest wheel.
I also think any downsides of the rims aero nature - will be minimal as the bags and my body will be the biggest wind catch that can’t be taken away. And perhaps (I will have to see) I’ll get more power transfer from the somewhat deep rim.
I have also asked Jakob to what design he’d come up with if this was his P/B frame as I’m willing to entertain the idea of getting bags made. However being the copy cat I am I’d prefer to use the bags from the P frame used again by toutestbon 
There is a possibility I may merge the childish design you see above with this fantastic frame from @Aurelien
In some kind of Flag + MiniFlag type imbalanced affair 
As for tyres - I’m likely to go with what appears to be tried and tested:
- Schwalbe G-One Allround 2.25
But in follow up place would be:
- Rene Herse Fleecer Ridge 700x55c
- Goodyear Connector 700x50c
In short - a plan and a childish scribble are emerging and I’m excited to see what this project brings in terms of building fun and future trips!