Any tent can work. You're going to need to seal the mesh with some kind of substance, like a flex-seal. Gutter sealant will wok, too, and it's cheaper and comes in gallons, also. You can go over the seams with the same sealant. I'd throw a tarp over it, too. It's good that the floor is attached, as that makes sealing much easier. You can line it with trash bags, or plastic sheathing - anything helps. The biggest thing you can do is make sure you're generating enough CO to get the level up to at least 10000 PPM and keep it there. You're going to lose some CO when you enter the tent after reaching the appropriate level of CO concentration.
How are you calculating how much charcoal you need for a tent this size to reach high levels of CO? What type of charcoal will you be using?