: Good idea. Anyone in Eastern NC? I'm in Greenville.

That is the furniture manufacturing captital of America if not the world. There should be a spare tablesaw somewhere in the neighborhood.
I'd say your best options are
1. Find someone to rip it. Small cabinet shop, friend of a friend...,
2. Buy a small table saw ( if you're handy you'll find its nice to have a table saw around)
3. Do the circular saw trick. But take a long hard look at your fingers. Make sure the 'fence is parallel to the blade. Make sure the whole thing isn't going to tip over while the saw is running. Make sure you have a switch other than the one on the handle you can't reach.
I've seen the circular saw trick many times in China usually in new stores ripping shelves and trim. But consider too that China has a very high industrial accident rate.
If I was going to rip 16' boards with a circular saw clamped to a piece of plywood, I'd probably put it in the middle of a 4 x8' sheet of 3/4 on a frame to keep it flat, I'd have that screwed to four saw horses and I'd have a fence 6' long and dead straight, I'd have a friend pulling it out the other end, I'd have a push stick and the blade covered from the top.. . . .