Ummmmm, that does look good
. That's the way we always had roast beef sandwiches when I was growing up - homestyle I call it - and I still fix 'em that way at home.
The famous Beef on Weck places in Buffalo, NY, use a center cut round roast, I think. See the reviews for Charlie's and Schwabl's on this site.
The famous smoked meat sandwiches of Montreal are slow aged and smoked brisket. You'll can google for Lester's and Schwartz's; they both have websites.
All of these make my mouth water just to read about.
I think I've read the so-called sirloin tip roast is actually a round roast and that's what my beef chart shows.
If you have any leftovers, wrap 'em up and ship 'em to me