I also know of one younger couple that made a portable Indian style Long House to take to events.
They laid out 2x4's as wide and long as their trailer, and nailed them together at the corners - with triangle plywood braces. They then drilled holes through that framework - to put willow poles through. They laid it on the ground, poked long green willow poles through all the holes, and then started tying pairs of them together - from one side to the the other. This created their arched frame. Each end the ran the poles striaght up, and tied them to the arch to help stiffen it. Then the tied long green willow poles along the sides - to stiffen up the sides and top.
With their framework made up, they then cut canvas tarps to fit over it - overlapping where necessary. And leaving a section right in the top center that they could uncover to use as a smoke hole.
They made it all up at home, and got it all tweaked to look and work right. To go to an event, they picked the whole framework up and set it on their trailer. Then tied it down to the trailer. The canvas pieces were rolled up and packed right inside that "cage" type framework.
At the event, they would pick that framework up off of the trailer and set it in place. A couple steel stakes pounded down in the corners through those plywood braces locked it into place. Then they pulled the canvas tarps over it. The back canvas cover was just put up and the extra corners/edges just pulle over the sides and tied in place. The front they fitted better - including a doorway to fit the framework. A larger canvas hung down over the door. And a separate small piece of canvas was tied to ropes and pulled up over that smoke hole. It was then pretty easy to pull to the side when needed.
It was a pretty neat idea, and worked well for them. It just looked kind of funny when they were driving down the road with that weird "cage" on their trailer.
In your search for a wikiup, you might also search for a sweat lodge. The full dome is the same for it as the wikiup.
Mikey - that grumpy ol' German blacksmith out in the Hinterlands