I lifted this photo off facebook.  It shows a bunch of kayaks and canoes all rafted up together to set a Guiness Book world record.  The photo came with the following info:
"The largest raft of canoes and kayaks consisted of 1,902 boats and was achieved at the event "One Square Mile of Hope". The event was sponsored by the Central Adirondack Paddlers Society, and took place on Fourth Lake in Inlet, New York, USA!"
The photo got me to thinking, how many kayaks are there in the world right now?  Probably lots and lots, maybe even millions, thanks to the miracle of injecting plastic into a mold.  This is not intended to be a slam on plastic kayaks by the way.  Even home built skin on frame kayaks in the world right now must come close to the number of skin kayaks that existed at the peak of population in the Arctic. 
Aleut population at its maximum was estimated to be about 20,000.  Perhaps a third of that population was adult males each of whom supposedly had a kayak. So at its peak, there were perhaps 7000 kayaks in the Aleutians. 

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The original Glen-L plans call for a seat riser that runs from the forward frame to the transom, passing through this cutout in Frame #1.

So, Im in this "blocking" phase. The next step is to attach blocking on the sides of the hull to support each end of the rear seat. (Basic "bench" seats are also called "thwarts" in nautical terminology.)

The original plans call for a full-length seat riser to be attached to the sides of the hull. Thats the purpose for the unique cutouts on the sides of Frame #1 that youll see on the Glen-L Utility model. So far, there arent a whole lot of well-documented Utility builds. However, among those Ive seen, most do not use the full-length seat riser. Instead, these builders simply attached blocking to support the seats.

The original plans also call for 2 separate aft seats, on either side of the boat. Im not going to do that. I want a simple back thwart, and front thwart.

Glen-L line drawing of the Utility

I debated on the full-length seat riser. However, I decided against it for a few reasons. One is time, as Im now quite anxious to get this boat in the water. Another is the fact that Id have to either cut the frame cutout more, or plane the full length of the seat risers, because my cutout is less than a "store-standard" 3/4" depth. A third reason is the fact that Id also have to make another cutout in the seat riser itself, to accommodate the butt blocks that connect the side panels of the hull.

Nope. Simple blocking it will be.

The next question is, "How to attach it?" I realized that if I install the blocking on either side first, then Im taking something of a gamble on them actually being on exactly the same plane. I do not want my seats to slant, obviously.

The other matter to attaching the blocking on the sides first, is the fact that Id have to retrofit the center support. I have already planned to build a different type of center support than Glen calls for, anyway.

How my center supports will differ:
Glen calls for 2 plywood center supports for the front thwart. These supports are glued to either side of the keel, and then attached to either side of blocking that is underneath the thwart itself. Like this:

A Glen-L Utility at the "G8" Glen-L Gathering in 2014. Thanks to the kindness of this boats owner, I was actually able to drive this one & take one of my children out in it. Note the construction of the center support under the seats.

Im planning to build a different type of center support, based on one I saw in a photo of a 1935 Riva. Mine will have a single plywood support, mounted on top of the keel, on the centerline. I will have 1" x 1" blocking on either side of the plywood support, both at the top and bottom.

Center seat support on a 1935 Riva

Back to the point...
I had another idea. What if I build & install the center support first, then make sure the thwart is level... then, use the thwart itself as a point from which to install the blocking on the sides? It seems to me that Id stand a better chance of having the seat installed level, once its all done.

So first, I marked the sides, where the top of the blocking (seat riser) should be, at right angles to the frame. Then I taped twine from measured points on these lines, stretched across to the other side. Measuring the height from the keel to the twine, I found that each point was 8 inches.

I plan to make the thwart 12 inches wide. I want the center support to be slightly narrower, so I decided it should be 10 inches. Knowing that I plan to use 1" blocking, I then had the dimensions I need to draw out the center support.

Half-breadth of the seat support, drawn out on the computer.

So, I drew the half-breadth of the seat support in Adobe Illustrator & printed the pdf full-size. I then cut out the print & traced it, full width, onto poster board. Once I cut that out, I had a template which I can now transfer to the plywood.

Poster board template for the center support. So far, so good...

The next step is to actually build it. 

Lets hope all this works.

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