I've also been working on a new outrigger. My last outrigger, made with PVC pipe, was too flexible.
I ordered carbon fiber, which I am assembling into a new outrigger.
Here is the central "T". Outriggers attach to arms which will hang down from the ends. I have reinforced the central axis with a bit of kevlar I had around.
I will trim the kevlar, hand the arms, and attach new outrigger pontoons.