Thanks so much Matt,
My raft had first virgin cruise today and I would like to share some more pics and points about it.
It was super fun to paddle with my DIY raft on the sea, your design is so good that even this is my first packrafting with kayak paddle (I was self-trained with Canadian style canoeing with an oar) it can be handled very well on the sea waves. Speed is way faster than my inflatable PVC canoe.
Today’s weather is fine, wind is peacefully in scale 3 to 4, normal waves size is small compare to the size of the raft. There were occasional invasion of big waves, caused by speed boats, with peaks higher than the packraft, however my raft could surf over the waves easily with very good stability. Sea water was spreading everywhere when the raft hitting the waves but it is OK water inside the raft was not much (less than a can of beer) to cause uncomfortable.
However, I was so disappointed with my DIY 2nd floor mattress, It was deflating in the middle of nowhere between launching site and a small shell island I was going.
I must redesign it and make it more reliable, but how, the air pressure inside is so high.
By the way, the fabric is tough that shells did no make harm to the raft bottom when I was crash landed it on the shells and rocks.
One more point is my paddling posture, I found that I needed a higher sitting position in order not to hitting the tubes with my elbows. I feel much better paddling after placing my inflatable back rest under my bum. I think that I need to make a good seat as well.
So, a reliable 2nd floor mattress and a good seat are my next DIY projects.
I think the green colour fabric is good, hope they would get through soon and I could use it.
Have a nice day and happy paddling!