Years ago I was in need of some walnut wood, and a friend of mine had some rough cut he wanted to get rid of.
I live in a very rural area, so getting my planks to a mill house wasn't an option. Snapping a string for straight edge, then free handing the plank through the saw is not fun, and quite dangerous to boot. Then there is the joining process, and I never really liked that step with a "not-too-true" edge to begin with.
I created this sled to do the trick, and with a very good, non-flexing rip blade, I have been able to many times skip the joiner altogether.
A good plywood such as Baltic Birch works very well for this sled. The material you want to use needs to be stronger than particle board.
I hope you get some value as I have.