Comment--> I think a tablesaw with a dado blade would be my choice.Make a dedicated crosscut sled(some guys call them crosscut boxes)that you can use year after year.
I suggest making the rear fence tall enough to really support the workpiece(s),and long enough to incorporate a flipstop so you can cut the
I fasten a registration block(make it a frog hair narrower&shorter than your dado is set)to the fence,away from the outside of the dado by the width of your dado. Then you make your first cut tight to the registration block(the board is standing up right?).Then you pull sled back,put the first cut over the registration block and make second cut,repeatfor third cut,etc.
Reply--> This is exactly how I do it. You can make this jig from scrap wood, and use it for years to come. The only problem, is that is the only joint size you can make accurrately. (at least for me) But I can get it setup, and get perfect box joints all the time. It really works well.
Dale Richards<br />Dal-Col Apiaries<br />