Hi Robert, I don't think we're supposed to talk about scanning here on APUG, but I do this a lot and always "reflective".
You can also make fine and beautiful contact prints of course, but I do understand the desire to have a positive bigger than 4x5.
I recently built a very simple foamcore box camera that can take paper negatives up to 8.5x11. I'm still learning how to use it, and it's a "1-shot" camera ( then home to swap the paper out in darkroom ), but very fun!