I have decided to try and tackle the making of new bow section cushions for the good old stingray. This is the last major project for the boat before I claim that its done. Anyway, I was able to find a sewing machine on CL that is able to handle at least 6 layers of vinyl, (I didn't try any thicker). I decided the next step was to tear the old cushions up to see what they were made of. This was a lot harder than I thought. Funny that the vinyl would tear/break easily but that thread was not going to let loose. Finally was able to get at it with a razor blade and got the panels 99% intact.
I have actually come up with come questions about the construction of the cushions ans was hoping to get some answers or at least thoughts on how I should move forward.
1. In the picture below, this is the top section of one of the seat cushions in the bow, as you can see it is in three sections, sewed together. Does anyone know if there is there a reason that it was done in three panels? Vinyl is wide enough to do this cushion in one piece. Is this just for looks or is there a reason that it should be done this way?
2. The top section of vinyl had what seems to be a foam backing on it. This foam is 1/4 inch thick but it has some kind of weave glued on it almost like cheesecloth. I am not sure what purpose this foam/fabric serves. It is in addition to the 1.5 inch seating foam that is in the cushions also. It can be seen in the next two pictures. I have seen vinyl with foam backing available online so I assume that is what this is. Question is in necessary? I can just get 1.75 inch seat foam and keep the measurements in line. Just not sure if I would be missing something.
3. There is a black plastic type fabric with holes in it on the back of the plywood, it looks like the picture below, what is this called and is it necessary to replace?
4. Is it common practice to try to waterproof the plywood when replacing with epoxy, paint etc. I wonder if it is worth the added expense.
I appreciate all thoughts on this as I want to make sure I get this right the first time, which would be the first time.
I have actually come up with come questions about the construction of the cushions ans was hoping to get some answers or at least thoughts on how I should move forward.
1. In the picture below, this is the top section of one of the seat cushions in the bow, as you can see it is in three sections, sewed together. Does anyone know if there is there a reason that it was done in three panels? Vinyl is wide enough to do this cushion in one piece. Is this just for looks or is there a reason that it should be done this way?

2. The top section of vinyl had what seems to be a foam backing on it. This foam is 1/4 inch thick but it has some kind of weave glued on it almost like cheesecloth. I am not sure what purpose this foam/fabric serves. It is in addition to the 1.5 inch seating foam that is in the cushions also. It can be seen in the next two pictures. I have seen vinyl with foam backing available online so I assume that is what this is. Question is in necessary? I can just get 1.75 inch seat foam and keep the measurements in line. Just not sure if I would be missing something.


3. There is a black plastic type fabric with holes in it on the back of the plywood, it looks like the picture below, what is this called and is it necessary to replace?

4. Is it common practice to try to waterproof the plywood when replacing with epoxy, paint etc. I wonder if it is worth the added expense.
I appreciate all thoughts on this as I want to make sure I get this right the first time, which would be the first time.