Hello and welcome Bentpushrod. I used thickened epoxy on my gaps of my stemless build. I could've done better with the color match, but hey, If someone has to look that close to point it out it's time for them to leave. 
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You can see the little darker spots where I filled gaps. There were two spots where I had use a wood chisel and square up a few short pieces, so I could glue in and then epoxy a half inch long piece on the end. I'd have to look at it closely to find it now. Wife and I take it out frequently, no epic trips just day paddles, and I finished it 3 years ago. I've had no issues with any spot that I have used epoxy or pieces to fill in on, boo-boos. I've even had an air compressor blow up and the twin cylinder part tore a chunk of my gunwale.
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Epoxied a new piece in, and no issues. I'd have to look to find it. It needs a fine sanding and a couple coats of poly, and it would look good as new. Wood strippers are tough. I used lots of staples and screws to.
I couldn't imagine building one with out staples and screws. Yours is looking great. It looks straight with a good shape.
Roy
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You can see the little darker spots where I filled gaps. There were two spots where I had use a wood chisel and square up a few short pieces, so I could glue in and then epoxy a half inch long piece on the end. I'd have to look at it closely to find it now. Wife and I take it out frequently, no epic trips just day paddles, and I finished it 3 years ago. I've had no issues with any spot that I have used epoxy or pieces to fill in on, boo-boos. I've even had an air compressor blow up and the twin cylinder part tore a chunk of my gunwale.
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Epoxied a new piece in, and no issues. I'd have to look to find it. It needs a fine sanding and a couple coats of poly, and it would look good as new. Wood strippers are tough. I used lots of staples and screws to.
I couldn't imagine building one with out staples and screws. Yours is looking great. It looks straight with a good shape.
Roy