Actually, I do not work with metals, I am a high school assistant principal, I just know that when working with materials like aluminum tubing it is best to have the correct or as close as possible measurements, and some people prefer fractions, and others decimals, and it was no problem to put both.  

I don't think you would have problems putting in the slider at all...  I think the biggest problem would be how to fit the slider tubes on the seat, but again I think you could use the conduit holders to keep it in place.    

I put a removeable 3rd seat  that I built in mine so I could paddle it solo, (when there was no wind of course) I have since bought a Wilderness solo and don't paddle th SR 18.5 solo any more.   I also built a seat back that slides onto the bottom of the seat and does a good job of giving you support.   Here's a link to a picture of it on my solo...

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Bruce