Hi Mikkel
It's such a relief to see you posting again, I was afraid "Slipper boy" would be your swan song .
Just a thought about the lack of gutters on your smaller shelter, the one at Lustleigh does have a brick base, if the wooden structure sits directly on a hard floor you will get rot up the lower nine inches or so. We don't have heavy rain, just lots of little bits, so the constant drip and splashing up causes the bottom planks/ends to be damp all the time.
Either an interesting retro-fit of gutters or a different weathering opportunity.
Keep up the good work, I always admire your depth of research.
Ash.