Pipe length for a three person, 6 ft is fine most cases. You could go 6.5 or 7 if you are planning on using it in other shelters, or just want a bit longer pipe. Our stoves sit a foot up, with the damper they are probably 14" from the ground. The apex of the tipi is about 5'10".


Lightweight Tipi Tents and Hunting Tents https://seekoutside.com/tipis-and-hot-tents/
Backpacks for backpack hunting https://seekoutside.com/hunting-backpacks/
Hot Tent Systemshttps://seekoutside.com/hot-tent-combos/