Pallet compost station design question

I'm putting together a 2 bay pallet composting station.

I have decided to orient it such that the slats are vertical to avoid compost collecting on the slats.

I'm now wondering whether it would be more advantageous to add extra wood to block the vertical gaps.

By leaving them open I see the advantage of more air-flow. I also wouldn't have to do the work and use the materials to put more slats on. I do have scrap wood enough to fill them I believe.

By filling them I can more easily contain and collect the composted material.

I haven't ever really worked with an enclosed compost station much, so if anyone has any feedback on either design it would be appreciated.

Here's a picture of the set-up as it stands right now.

I have built one from pallets with slats positioned horizontally. I use it for humanure. I use wood mill dust and finer wood chips for separation and dry hay for the sides. It never smelled a bit and it never leaked anything and what I'm adding there is very liquid: humanure mixed with grey water.

I just tore down and replaced my pallet compost station. I had mine up like your and it hold material fine. I had them for about a year and a half and the bottoms were almost rotted through. They would’ve held on a while longer but I was moving my compost area anyways so I made something a little more long term but the pallets were free so I can’t complain about longevity.

I have a 4 bay station similar to yours.  I do have a long horizontal brace across the bottom at ground level.  I have a similar brace across the top about afoot from the back.  These significantly add to the rigidity.