Fred, I will try to get as close as I can cutting my tenons with my saw without going to far, which means, I stay proud of my lines and trim to fit. I wish I could say I stay 1/32" away from my line, each time, but life doesn't work that way, this time yes next time I don't know. I just plan on fitting by hand with my bull nose. On this table the sides and backs are all flush. With small legs, as on this table, I would quite often 45 the inside of the tenon to get my maximum amount of gluing surface, but with that said I would not say the 45 is a common occurrence. I will bevel all ends of the tenons to avoid splitting of mortises.
Now that I have my bottom front rail mortised and fit and my top front rail dovetailed and fit I am ready to glue up. I will dry fit one last time before the glue up. Drum roll please.
But not to worry I use Elmer's white glue. Should I hang my head in shame? I think not as I glue to my hearts content, not worrying (as much) about the open time or the fact that it's 62 degrees in our shop.
My glue up process would consist of the sides first then the back and then front. Measuring from corner to corner to assure that the case is square. If all fits properly there will be no reason to clamp things. Now I can get to my other projects that hopefully will pay my wages this week or maybe next week.