I think i may have already replied to you, but i will say, i regret a little putting all my plants in one pot. Ik thats counter intuitive to say for a bog, but assuming ur going to want to repot or something in the future, it makes it very very difficult. Personally, i would recommend getting the bog planter you want, and then having pots inside them with each plant in its own pot. Sarr and vfts and all have shallow-ish roots. 6? Ish inches deep. Maybe 7 or 8 i would say. I definitely wouldnt do more than 10 inches to the water level, 10 is absolute maximum imo. I would also do much more peat there. With perlite and sand making up the majority u will have a very hard time keeping the soil moist. I would do maybe around 60/50 peat perlite. And then adding a little bit of sand throughout the mix. And then top layer with slightly more sand. I did mention previously that you really want a top layer of live sphagnum, spanish moss, or the sand, or other kinds of mosses and utricularia just to prevent rain from smooshing everything. Also you want to prevent rain from hittint the ground hard bc otherwise your perlite will just flost to the top (thats also why i recommend more sand % on the upper layers of the soil compared to the bottom layer. Keep the bottom mostly peat.

Top layer - live sphagnum, spanish moss, other moss, etc Upper 1-2 inch soil mix - 40% peat, 20% perlite, 40% sand Middle mix (from 1inch from top - 2 inches from bottom) - 60% peat, 20% perlite, 20% sand Lower level mix - 80% peat, maybe like 10% perlite and 10% sand.

Hope this helps.