With newer modern pc's, resolutions are high, so when you try to play Willie Beamish in a Dos Box window, it looks rather small.
Playing full screen is not that visually appealing, so what to do? Play it in double the window size. Here's how.

Keep all stock Display settings with the following changes:

Display: Output - OPENGL
Full Screen Resolution: 1024 x 768
Window Resolution: 1024 x 768

That's it!

(Took me an hour of trying different settings and I figured out that resolution sizes dont matter if OUTPUT is still on "Surface".)

Enjoy!