An illuminating article about graphite rods.
And as for a kayak rod length, I chose a rod that I can work a fish around the bow, at least 7' and a handle around 7" so it doesn't hang on my PFD or shirt when I throw from a seated position. I also look for accessories like hook hangers, micro guides (8 or 9), and very light weight.
Custom rods are very pretty, but, thread and epoxy weigh as much or more than rod material, so I'll always opt for as little wrapping as possible.
Another thing that is 'icing on the cake', is when I mount my reel on my new rod and throw it in the water, I expect the setup to FLOAT! Yes, if you want to keep your rod and reel safe ALL the time, you can chose a combination that will actually float without extra flotation. Of course, I don't expect that to happen with a 1 oz jig attached.