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@Rik_Van_Looy
Moving onto the detail:
I'd been umming and ahhing about OS tubing cos I always rode OS steel MTBs BITD but that Secan convinced me of 28.6mm for neat minimalism - Cromor DB probably (cost effective and not too porky).
Clearance for 2" tyres + 2 sets of bottle bosses + mudguard bridge
(I'll need to work out where the bridge sits to give a neat mudguard line without clashing on a 42mm knobbly)..
Thru routing for rear brake - I'm not 100% sure how to handle this but think it would be neat.
My thought was to go in through the butted bit the at the top of the downtube and out through the bottom just before the BB.
The cable/hose would pass round the BB and enter chainstay on the underside, emerging at the top shortly before the flat mount.
I'll only ever want to run 1x so I guess gear outer could take the same route but via the right chainstay (that means cable outer all the way which I'd guess is normal for internal routing.)
The fork I have looks pretty neat with an internal headset so I think I'll go that way...
68mm BSA BB will keep my options open (from past experience with jumpbikes etc spacers seem to work OK if a wider axle is required)
With skinny steel tubes it'll be a 27.2mm seatpost and I think I'll go for a separate clamp just for toughness and simplicity.
I'll flesh out my drawings with these features see if it all makes sense....