Garden side entrance - rebuilding fence/wall help

[Kburrito]

Hi,
I finally have some time to tidy up the front garden, and one of my first projects is to rebuild the side entrance to the garden and garage.

I have several unused marine plywood panels and thought of creating something more substantial than just a fence for the front (see attached pictures). My plan is to build a wall from the plywood, add battens, and finish it with horizontal wooden cladding. I also intend to make a custom door from the plywood and clad it to match the wall (theres a reason for the over-the top wall for a garden, bare with me).

Here's my very simplified step-by-step plan:

1. Attach a post to the wall.
2. Attach a post to the existing concrete post (as seen in the picture, it's level and sturdy).
3. Secure posts to the concrete panel garage. If there's no obvious place to attach, I might use rods with epoxy drilled into the ground.
4. Attach the plywood panels.
5. Finish with cladding on the outer-facing wall.

In the future, I might build a lean-to shed between the garage and the house, so this wall would be the first step. Eventually, I’d like to add a transparent roof from the house wall to the garage.

(Options im pictures) Would you recommend Option A: a flat wall with a slight slope at the end, or Option B: forgetting the lean-to altogether? Or do you have any other suggestions?

I understand the plywood wall might seem a bit much, but I have plenty of it and would rather use it than let it go to waste (I've already used a lot on a garden house).

A few other questions assuming this is okay so far:
1. Would you add posts along the floor as if it were for a normal wall? (with DPM below), Basically treat it like its a proper wall?
2. Is a Post attached to the wall using something like thunderbolts okay? or are hammerfix fixings okay?

Thanks for any suggestions, tips, or help!

 

[Kburrito]

Wrong category, cant seem to delete this post. Reposted here https://www.diynot.com/diy/threads/garden-side-entrance-wall-fence.631223/