Options You may wish to try making a more historically accurate frame. I was told to avoid it unless I was very sure of the wood quality. If you use 5 boat oars, it is a viking tent. If you use 5 spears, it is a landesknecht tent. People tell me that purchased lumber poles will probably be too flawed.
Some people make the ridgepole stiff by sliding a long piece of conduit over the middle of it.
I do not know how the fabric will bunch up when the poles extend up beyond the roof, but that is how the period ones were put up. Assembly will be easier, since the frame can be tied together flat on the ground. It seems reasonable to make false decorative tops to add to the poles so you can switch between the two styles of viking and landesknecht. With a bed to stow things under I have plenty of room. You can also make a clothes rack by having a clothes rod hang down from the ridgepole.