Looking good so far, John. Which sprung axle guards are you using? Looks like you have swapped the axle boxes for grease ones too, appropriate for your period.
The last of the 4-planks had the DC1 brakes supplied in the kit, so you could go with those (though by that time they would have oil boxes from new, I think). If you do, watch out for the brake push rods that should be the other way round. If you do conventional lever brakes, then the push rods are fine.
Nick.