if you did use a sewing machine, be sure to use a composite thread of both plastic/cotton thread.
just plastic thread will cut through the cover creating tiny holes along seams, just cotton thread not strong enough.
plastic thread wrapped with cotton thread gives combo of strength and not cutting through cover under tension.
if you want to just glue, using Vinyl is handy, as there are some industrial strength super glues that literally melt the plastic together via chemical reaction (you can sometimes see smoke / fumes as its glued).
when assembling pieces of vinyl for gluing, it important to figure layout so that when finished cover on yurt, there are no upward facing seams for water to run into, in the event glued seam separates a bit (think roof tiles and how rain-water runs over tops).
hope that helps. perhaps somone can suggest a super-duper strength glue for melting vinyl together