Here are the results of the first rug experiment:
It'll stay on the loom, since the warp is tensioned & working well. I will probably weave the entire warp and then remove the woven rugs & see how they look.
My 40" fabric tube made a rug that measures about 50" on the loom. With the 39" warp width (about 37" woven), that is a bit short. Especially since it will shrink once it isn't under tension on the loom, and probably further with washing. I would prefer something closer to 60" or even 64". But the length in this case was based on some cloth I had on hand.
You can see the thread repairs hanging down, these will have to be properly finished when the rug comes off the loom.
The structure is plain weave, so the log-cabin style threading pattern shows a little bit. But with these bright colors, it doesn't show much!
I have selected the fabrics for the next experiment, but not begun the process yet.