Ha ha so the mud is basically plaster then lol, or not? Anyway I had an image of an africans 16th century mud hut!
That rooms a beauty mate, good set up just needs some tweaking here and there like anyone elses. I changed mine round 3-4-5 times last grow and improved it every time, made some basic errors but all done on a budget of sweet fuck all using old lamps, borrowed this, stolen that, donated, pawned and second hand gear. I think a great room takes 2-3 grows before its all dialled in unless you have shitpots of cash and and all the time in the world to build the room, backed up by your experience of course! I hate tents personally but its the way forward for indoor I s'pose, keeps things simple and much easier to dial in.
I just did a run using a can-fan 8" 800? ish cfm in a 5 light roomwith 16 super stinky blueberry JH Cheese and it does stink believe me, we had a strain here in the 90's called Exodus Cheese which could overpower most home systems and this is on a level par easily!!!. But basically after stopping the co2 and recircing cos the smell was too bad, I run the duct straigth outside and put the carbon straight above the plants instead of to the side, the smell was all sorted.
ORIGINALLY HAD IT TO THE SIDE...
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THEN I MOVED IT ABOVE LIGHTS...
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I see your filters also sat on its coned end on the floor? It has a detrimental effect to the environment when air is pulled from down below as well as losing efficiency. I remember studying air flow systems a bit at agri-college, but from memory you draw a good deal of the heavier (AND BENEFICIAL) co2 which is harder to push for a smaller fan. This causes a back draft of heavy co2 (odourised in your case possibly) air dropping back into the room effecting the ppms, which for us is ok because we don't inject over 1200ppms for MJ normally but when farms have people inside all day and ppms go up to 5000 lol they can be explaining a few dead illegal immigrants!
I'm like a woman with a party sausage endowed fat fella fucking her, its up top for me every time mate but someones gonna say it doesn't make a difference... the position of fan not the sausage bit